#serious-discussion | Mathematics | Page 462

fast ivy Sep 12, 2021, 3:52 PM

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It's from 1950 or something

surreal sapphire Sep 12, 2021, 3:55 PM

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just study some graph theory

blazing pawn Sep 12, 2021, 3:55 PM

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The newest one i know if is from 2007 i think

fast ivy Sep 12, 2021, 3:55 PM

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2007 stare

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What is it about?

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Man, I hope one day to be able to read some math papers.

blazing pawn Sep 12, 2021, 3:56 PM

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hyperbolic curves over finite fields are determined by their fundamental groups pretty much

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isomorphisms of schemes are in bijection with isomorphisms of etale pi_1

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the non finite case is much uglier to state opencry

fast ivy Sep 12, 2021, 3:58 PM

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Algebraic geometry memery stare

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Is this from a paper?

blazing pawn Sep 12, 2021, 3:58 PM

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No

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well i mean yea but i havent read it in the paper

fast ivy Sep 12, 2021, 3:58 PM

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Oh, what's the reference then?

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I hope to learn some more AG in the future.

blazing pawn Sep 12, 2021, 3:59 PM

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Szamuely

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do not read szamuely

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bleak

fast ivy Sep 12, 2021, 3:59 PM

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stare stare

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Why tho?

blazing pawn Sep 12, 2021, 4:00 PM

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Bad book

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Pedagogically

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Read my paper instead once its done itll be better smugsmug

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Jk probably dont

fast ivy Sep 12, 2021, 4:00 PM

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Lmao

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Well, I am interested in the relationship between Galois Theory and fundamental groups/covering spaces of Riemann Surfaces.

surreal sapphire Sep 12, 2021, 4:01 PM

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moth is suffering so we dont have to

fast ivy Sep 12, 2021, 4:01 PM

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So his book seems interesting

blazing pawn Sep 12, 2021, 4:01 PM

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chapter 3 is ok

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chapter 4 is where things start to get

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Horrid

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when you have 3 contradictory definitions of curves and apply results from each interchangeably without stating any of the details

fast ivy Sep 12, 2021, 4:02 PM

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blazing pawn Read my paper instead once its done itll be better <:smugsmug:812884290282848266...

stare stare

blazing pawn Sep 12, 2021, 4:02 PM

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u will be able to read the paper if uve seen like Spec and the structure sheaf

fast ivy Sep 12, 2021, 4:02 PM

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Like a real paper? Or like lecture notes ?

blazing pawn Sep 12, 2021, 4:02 PM

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"real"

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its just an expository thing im writing

fast ivy Sep 12, 2021, 4:02 PM

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Omg that's impressive

blazing pawn Sep 12, 2021, 4:02 PM

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Lmao hi nGroupoid

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No it is just expository its nbd

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though i understand these things much better now in the process of writing about them

fast ivy Sep 12, 2021, 4:03 PM

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Still, it's interesting that you can publish something at such an young age.

blazing pawn Sep 12, 2021, 4:03 PM

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Because now the details arent fucked

vivid halo Sep 12, 2021, 4:03 PM

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"publish"

blazing pawn Sep 12, 2021, 4:03 PM

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ill probably just put it on arxiv opencry

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but i will tell colleges that this is "published" smugCatto

vivid halo Sep 12, 2021, 4:03 PM

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hmmm

fast ivy Sep 12, 2021, 4:03 PM

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blazing pawn u will be able to read the paper if uve seen like Spec and the structure sheaf

Oh yeah, I am familiar with locally ringed spaces and the prime spectrum of a ring.

vivid halo Sep 12, 2021, 4:04 PM

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I would refrain from doing this imo

fast ivy Sep 12, 2021, 4:04 PM

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And I know the definition of a scheme

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And that's about it

blazing pawn Sep 12, 2021, 4:04 PM

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Well what im going to say is "paper published on arxiv"

vivid halo Sep 12, 2021, 4:04 PM

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no I mean like

fast ivy Sep 12, 2021, 4:04 PM

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That's what I know about modern algebraic geometry

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Basically

vivid halo Sep 12, 2021, 4:04 PM

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your first arxiv posting shouldn't be something expository

blazing pawn Sep 12, 2021, 4:04 PM

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Oh

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Why hmmCat

vivid halo Sep 12, 2021, 4:05 PM

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I mean it depends on how original the exposition is

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but like

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you sorta don't want to devalue the quality of your arxiv postings early on

blazing pawn Sep 12, 2021, 4:05 PM

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This paper was written as an elaborate call out post.

limber perch Sep 12, 2021, 4:05 PM

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post under a pseudoname

bronze pelican Sep 12, 2021, 4:05 PM

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Arxiv is just preprints

limber perch Sep 12, 2021, 4:05 PM

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Moth Inshambles

blazing pawn Sep 12, 2021, 4:06 PM

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Uh would that really matter at my age

vivid halo Sep 12, 2021, 4:06 PM

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possibly not, but it could matter later on

devout nacelle Sep 12, 2021, 4:06 PM

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Jacob Scholze

bronze pelican Sep 12, 2021, 4:06 PM

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In what way could it possibly matter ngroupoid

blazing pawn Sep 12, 2021, 4:07 PM

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I feel like i have a lot of time to do serious things in undergrad

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idk maybe im confused by what u mean by devaluing

bronze pelican Sep 12, 2021, 4:07 PM

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Ppl post their undergrad thesis to arxiv all the time

vivid halo Sep 12, 2021, 4:07 PM

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yea it depends on how original the undergrad thesis is

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but generally it's like

bronze pelican Sep 12, 2021, 4:08 PM

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I don't think your arxiv history is that important

vivid halo Sep 12, 2021, 4:08 PM

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it kinda is

blazing pawn Sep 12, 2021, 4:08 PM

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by devaluing do u mean like people would be less inclined to take things i put on arxiv seriously

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down the road

vivid halo Sep 12, 2021, 4:08 PM

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sorta

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like the rule of thumb that kinda exists for arxiv is like

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if you're posting expository stuff it's usually expository stuff that genuinely takes a very different approach to previous exposition

blazing pawn Sep 12, 2021, 4:09 PM

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monkaS

bronze pelican Sep 12, 2021, 4:10 PM

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Anyway moth, you can make a website and put your thesis on there if you don't wanna put it on arxiv

vivid halo Sep 12, 2021, 4:10 PM

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yea this is best practice

blazing pawn Sep 12, 2021, 4:10 PM

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sure i guess it probably doesnt really matter

vivid halo Sep 12, 2021, 4:10 PM

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and definitely have your letter writers speak to it

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that's important

surreal sapphire Sep 12, 2021, 4:10 PM

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~~published on vixra~~

blazing pawn Sep 12, 2021, 4:10 PM

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(for college apps i mean)

vivid halo Sep 12, 2021, 4:10 PM

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yea

blazing pawn Sep 12, 2021, 4:11 PM

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my paper is novel and original because unlike szamuely it is correct :gigachad:

fast ivy Sep 12, 2021, 4:11 PM

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why the sully stare

blazing pawn Sep 12, 2021, 4:13 PM

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well i doubt there are any journals that publish expository work i could get this in and it almost definitely wouldnt be in time for college apps so

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nozoomi

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oh well

vivid halo Sep 12, 2021, 4:13 PM

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yea that's fine

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it's more important that your letter writers speak to it instead

blazing pawn Sep 12, 2021, 4:13 PM

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I dont know if thats true for undergrad lol

vivid halo Sep 12, 2021, 4:14 PM

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hmmm

blazing pawn Sep 12, 2021, 4:14 PM

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undergrad apps are funny

vivid halo Sep 12, 2021, 4:14 PM

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I mean at the same way it also doesn't matter that it's on a preprint server or not for this purpose

blazing pawn Sep 12, 2021, 4:14 PM

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i think if they take any of the things i do seriously my app would be impressive but its very possibly they will not take any of it seriously

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some AOs are dumb and dont know the difference between arxiv and real journals

vivid halo Sep 12, 2021, 4:15 PM

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right and I mean you don't want to sell it as a real publication either

blazing pawn Sep 12, 2021, 4:16 PM

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smugsmug i dont think it matters what i sell it as tbh i kind of suspect they wont take it seriously regardless

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but oh well

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i guess we'll see

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Not having any benchmark for how solid my application is is hard

vivid halo Sep 12, 2021, 4:16 PM

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yea I mean you don't want to be dishonest about it, since that can really backfire

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your application is likely totally fine lol

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I would just find a way to mention the project in your application without overselling it

blazing pawn Sep 12, 2021, 4:17 PM

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Im just putting it in on the list of activities which are like

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100 characters each or whatever

vivid halo Sep 12, 2021, 4:17 PM

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yea that's fine

blazing pawn Sep 12, 2021, 4:18 PM

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maybe i will elaborate on one of the EC essays for harvie but that would be about like

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the process of doing it

vivid halo Sep 12, 2021, 4:18 PM

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yea that's important

blazing pawn Sep 12, 2021, 4:18 PM

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not how good the """results""" are which 99% chance AOs would not be able to gauge anyway

vivid halo Sep 12, 2021, 4:18 PM

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imo that's more important than them possibly seeing that it's on the arxiv

blazing pawn Sep 12, 2021, 4:18 PM

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I hope so nozoomi

vivid halo Sep 12, 2021, 4:18 PM

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because 1) this means nothing to most people and 2) they won't read it, so they won't know anything about the process that went into it

blazing pawn Sep 12, 2021, 4:19 PM

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Yeah

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I hope my rec letters are good

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i have one from a columbia prof which i hope will be useful nozoomi

vivid halo Sep 12, 2021, 4:19 PM

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yea idk talking about the process of doing it is going to be more important than the finished product

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and yea your letters will be fine lol

blazing pawn Sep 12, 2021, 4:20 PM

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the process of doing undergrad applications sucks so bad

vivid halo Sep 12, 2021, 4:20 PM

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haha wait until you get to grad apps

blazing pawn Sep 12, 2021, 4:20 PM

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Ok at least those are like. actually about the thing you want to do

bronze pelican Sep 12, 2021, 4:20 PM

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Grad apps were better than undergrad apps for me

blazing pawn Sep 12, 2021, 4:20 PM

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undergrad apps are stupid

bronze pelican Sep 12, 2021, 4:20 PM

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Better process

blazing pawn Sep 12, 2021, 4:21 PM

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its like branding type shit

bronze pelican Sep 12, 2021, 4:21 PM

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blazing pawn Ok at least those are like. actually about the thing you want to do

nozoomi

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I still rememebrr one of the things undergrad admissions ppl emphasized is that "we are trying to build a cohort"

blazing pawn Sep 12, 2021, 4:23 PM

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yea

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i have to draft another personal statement nozoomi

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i am going to make one about sewing and how i am terrible at it :kek:

bronze pelican Sep 12, 2021, 4:28 PM

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I'm watching Ghost in the Shell and I have no idea whats going on

blazing pawn Sep 12, 2021, 4:28 PM

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Poggers

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GitS is so good

bronze pelican Sep 12, 2021, 4:33 PM

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If you don't understand Ghost in the Shell, then you’re dumb. This is easy stuff.

burnt dune Sep 12, 2021, 4:38 PM

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bronze pelican I'm watching Ghost in the Shell and I have no idea whats going on

.

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hhhhh

stoic ice Sep 12, 2021, 4:44 PM

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vivid halo haha wait until you get to grad apps

Am I still blocked?

deep mango Sep 12, 2021, 4:52 PM

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In my experience undergrad apps were a lot worse than grad apps

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Stress and work wise

devout nacelle Sep 12, 2021, 4:58 PM

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3b1b has a podcast on Spotify, and there's BBC's A Brief History of Mathematics that I really liked.

latent forge Sep 12, 2021, 6:02 PM

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no

last oxide Sep 12, 2021, 6:31 PM

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devout nacelle 3b1b has a podcast on Spotify, and there's BBC's *A Brief History of Mathematics...

those 3 episodes were p damn pog

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hmm

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ben, ben and blue was also p pog

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sad they stopped PepeHands

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but it was mostly about education ig

devout nacelle Sep 12, 2021, 6:32 PM

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sad

bronze pelican Sep 12, 2021, 6:40 PM

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https://youtu.be/NtoIXhUgqSk

YouTube

Mathemaniac

5 ways to visualize complex functions

Complex functions are 4-dimensional: its input and output are complex numbers, and so represented in 2 dimensions each, so how do we visualize complex functions if we are living in a 3D world? There are actually 5 different ways to visualize a complex function, and this video is going to explore a bit about each of them.

Some of you commented t...

▶ Play video

strange cradle Sep 12, 2021, 7:09 PM

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Hey, I'm soon about to take classes for the next semester, and I have a question regarding a specific class

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Where can I ask you on your opinion regarding if I should take it or not

devout nacelle Sep 12, 2021, 7:13 PM

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This place is fine.

strange cradle Sep 12, 2021, 7:17 PM

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So I'd possibly like to take Complex analysis this semester, and here's the list of topics that we're going to cover:
Potential vector fields, curl, curve integrals, Green's formula
Definition of holomorphicity, holomorphicity of polynomials, Moebius transforms and Riemann sphere
Holomorphicity of Laurent series, Cauchy-Riemann equations, harmonicity, harmonic conjugates, exponential function, complex logarithm
Complex logarithm, maximum principle, complex integral
winding number, Cauchy theorem, Cauchy formula, Morera's theorem, smoothness of hol. functions, hol. primitive functions
Taylor and Laurent series, isolated singular points
Residue theorem, Casorati Weierstrass theorem, Picard's theorems
Schwarz lemma, reflection principle, open mapping, Hurwitz theorem
Riemann mapping theorem, Poisson kernel and Laplacian
Riemann surfaces of mappings, cpvering spaces and analytic continuation
Little Picard's theorem, differential forms, Green's formula and d-bar equation, Runge's theorem
Functions with prescribed zeroes or poles, factorization, germs, Cousin problems and cohomology
Chain and cochain complexes, exactness, homology and cohomology gropus
Line bundles, classification of line bundles on Riemann sphere, homology and cohomology of spheres

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What's bothering me is that I've taken multivariable analysis up to Fubini's theorem (for double integrals)

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I haven't done stokes theorem

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So I'm asking whether I can catch up on this with my current knowledge and not get blown out

cold needle Sep 12, 2021, 7:19 PM

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yes you can do it

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dunno about the more indepth concepts u mentioned tho

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monkaS

fast ivy Sep 12, 2021, 7:19 PM

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You will do fine, you only need Stokes' Theorem to prove Cauchy's integral formula basically

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And you basically just use the Green's formula version of it

strange cradle Sep 12, 2021, 7:20 PM

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Can I get the grasp of Stokes' theorem in 20 days 🤣?

fast ivy Sep 12, 2021, 7:21 PM

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Sure, if you are talking about the version of surfaces.

strange cradle Sep 12, 2021, 7:21 PM

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And not manifolds right?

fast ivy Sep 12, 2021, 7:21 PM

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There's a general version for manifolds which you would prolly need much more time to prepare.

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Yeah

strange cradle Sep 12, 2021, 7:21 PM

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I see

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Cool

fast ivy Sep 12, 2021, 7:21 PM

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You won't need to know any manifold theory a priori.

strange cradle Sep 12, 2021, 7:21 PM

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Manifolds are usually taught on graduate courses if I'm correct/

fast ivy Sep 12, 2021, 7:21 PM

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What I would recommend tho

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Is some knowledge of real analysis

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Mainly topological notions such as continuity, convergence of sequences

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Also some knowledge about series of real numbers

strange cradle Sep 12, 2021, 7:22 PM

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Fourier series maybe?

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Or just classical series convergence and stuff

fast ivy Sep 12, 2021, 7:22 PM

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Stuff like fundamental theorem of calculus, mean value theorem and so on.

fast ivy Sep 12, 2021, 7:23 PM

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strange cradle Fourier series maybe?

No

strange cradle Sep 12, 2021, 7:23 PM

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Oh I'm comfortable with that 🙂

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Thanks for giving me the good news heh

fast ivy Sep 12, 2021, 7:23 PM

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Do you know John Conway's book on complex analysis?

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The second chapter covers the main topological notions you will need.

strange cradle Sep 12, 2021, 7:24 PM

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I'm at baby rudin level of topology

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Is that enough?

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Yeah it's enough

last oxide Sep 12, 2021, 7:32 PM

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this seems like a pretty indepth course

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but if you took multivar analysis, I think itll be fine

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is this a year course(

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?

strange cradle Sep 12, 2021, 7:34 PM

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1 semester

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I hope it won't last me a year!

last oxide Sep 12, 2021, 7:35 PM

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thats a lot to cover inna semester

strange cradle Sep 12, 2021, 7:38 PM

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I doubt it'll be hard to pass

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I guess they're just preparing us for the graduate course in complex

last oxide Sep 12, 2021, 7:39 PM

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that seems almost like a graduate course
except it doesnt have much anal nT ig

fast ivy Sep 12, 2021, 7:43 PM

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last oxide that seems almost like a graduate course except it doesnt have much anal nT ig

and it is lol

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I mean, we didn't cover anything about vector bundles or homology and cohomology theory at impa

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tho like

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we covered way more analytical number theory

last oxide Sep 12, 2021, 7:45 PM

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feels p much like a graduate course
everything after riemann and open mapping seems non standard in undergrad

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well I guess some other things are standard

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but not chain complexes

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but I like how it looks
it seems to have a little focus on things required for PDEs too
which is cool ig

fast ivy Sep 12, 2021, 7:48 PM

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We covered covering spaces, monodromy and riemann surfaces at the end of the complex anal course I took

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it's cooler catThin4K

bronze pelican Sep 12, 2021, 8:24 PM

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Paid 10$ to have this little portion of my shoe stitched

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bleak

neat lintel Sep 12, 2021, 8:25 PM

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10 dollars is not that bad, but you could have stitched it yourself

crystal stone Sep 12, 2021, 8:38 PM

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strange cradle So I'm asking whether I can catch up on this with my current knowledge and not g...

You'll be fine

crystal stone Sep 12, 2021, 8:38 PM

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strange cradle So I'd possibly like to take Complex analysis this semester, and here's the list...

This iss the standard stuff for complex

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I wouldn't be too worried about it

latent forge Sep 12, 2021, 9:17 PM

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ok choose a copy pasta

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im going to submit one copypasta for each problem set I submit for an intro to CS class

strange cradle Sep 12, 2021, 9:27 PM

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I hate taking CS classes along with math classes

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They seem like out of topic burden

wild jay Sep 12, 2021, 9:50 PM

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ikr

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AK

last oxide Sep 12, 2021, 9:52 PM

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PogO

neat lintel Sep 12, 2021, 11:07 PM

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Only puny humans hate taking CS and math together.

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Hulks see it as challenge.

leaden torrent Sep 12, 2021, 11:08 PM

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sully

neat lintel Sep 12, 2021, 11:09 PM

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Don't you Sully me, I'm right.

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hypersully

azure kettle Sep 13, 2021, 12:09 AM

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sully

strange cradle Sep 13, 2021, 12:16 AM

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hah

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I think you haven't taken real math and cs classes yet (:

deep mango Sep 13, 2021, 12:23 AM

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to be perfectly honest, my worst semesters were the ones with both CS and math

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Just

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Too much thinking in too many directions

strange cradle Sep 13, 2021, 12:25 AM

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Idk my cs classes were less about thinking and more about memorizing

leaden torrent Sep 13, 2021, 12:37 AM

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@glacial vale did you get a scam DM? if so, the moderators will look into it. spamming every channel is neither helpful nor welcome.

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(and pinging everyone 10 times is just obnoxious, even if this server has it disabled)

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if you dont respond, i'm gonna assume you were acting in bad faith.

deep mango Sep 13, 2021, 12:44 AM

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strange cradle Idk my cs classes were less about thinking and more about memorizing

Definitely not the case for me lol

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We could write reference sheets for all our CS exams lol

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Didn't help one bit

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Fucking brutal

neat lintel Sep 13, 2021, 12:54 AM

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If a right triangle has a base of 40m, and an angle of 30. What is the height? Whoever answers first, gets $10

deep mango Sep 13, 2021, 12:59 AM

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30 what?

leaden torrent Sep 13, 2021, 1:04 AM

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gradians

tall badge Sep 13, 2021, 1:05 AM

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revolutions

bronze pelican Sep 13, 2021, 1:10 AM

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I did CS minor in undergrad

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I procrastinated on all the assignments

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And spent 48 hours coding session on the day before projects were due to submit them on time

neat lintel Sep 13, 2021, 1:36 AM

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strange cradle I think you haven't taken real math and cs classes yet (:

I mean I'm in my last semester, and taking Linear Algebra.

limber perch Sep 13, 2021, 1:46 AM

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last sem of?

neat lintel Sep 13, 2021, 1:56 AM

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deep mango 30 what?

dude

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Angles

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30 degree angle

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bruh

smoky hamlet Sep 13, 2021, 1:57 AM

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does anyone know what the absolute value of x-1 is?

neat lintel Sep 13, 2021, 1:57 AM

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If x>=1 then it is x-1
If x<1 then it is 1-x

neat lintel Sep 13, 2021, 1:58 AM

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limber perch last sem of?

Computer Science Major / Math Minor 😬

limber perch Sep 13, 2021, 1:59 AM

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oh math minor

neat lintel Sep 13, 2021, 1:59 AM

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The work used to be a drag, but when I think of what I'm going to do with what I've learned and the people I'll meet with the skills I've acquired, I just get excited.

limber perch Sep 13, 2021, 1:59 AM

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that's not too bad then

neat lintel Sep 13, 2021, 1:59 AM

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True, true. . . But I self study a lot , lol.

deep mango Sep 13, 2021, 1:59 AM

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neat lintel 30 degree angle

You're sure it's not 30 arcminutes?

neat lintel Sep 13, 2021, 2:00 AM

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.

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oog

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flonshed

deep mango Sep 13, 2021, 2:00 AM

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stare

neat lintel Sep 13, 2021, 2:00 AM

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limber perch Sep 13, 2021, 2:00 AM

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30 archimedean furlongs

neat lintel Sep 13, 2021, 2:00 AM

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delet this, Alex.

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I’m American so

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30 nails

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30 tumours

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. . . . That is such an US thing to say. . . .

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30 dicks

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30 sticks

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I'm not even mad, I'm just disappointed.

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30 fingers

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Eff it, gonna make my money and just do what Evil Morty did.

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30 cosmdisfimisrfmosidmvowrfwefwefw meters

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||jack shit, I'm leaving. LOL ||

neat lintel Sep 13, 2021, 2:01 AM

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neat lintel ||jack shit, I'm leaving. LOL ||

oog

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smugsmug

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||America : "GO BACK TO AFRICA GUAPPI"||

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||Guappi : "Aight, bet."||

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||America: "NO WAIT COME BACK.||

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Wtf

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Is this fan fiction

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My set-up

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Lemme p/m you to clear up the misunderstanding and what the actual. . . .

vivid halo Sep 13, 2021, 2:03 AM

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neat lintel My set-up

best part is if you need to shit you just switch chairs

neat lintel Sep 13, 2021, 2:03 AM

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Alex, get that perfectly good toilet away from that filthy computer you heathen.

neat lintel Sep 13, 2021, 2:03 AM

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vivid halo best part is if you need to shit you just switch chairs

I mean, I don’t have to switch chairs if I don’t want to 😎

limber perch Sep 13, 2021, 2:34 AM

#

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I present to you the "I have no life" chair

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yes, the inside has a toilet

leaden torrent Sep 13, 2021, 2:34 AM

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#chill

fast ivy Sep 13, 2021, 2:55 AM

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neat lintel My set-up

Is it a Melty Blood set-up??

blazing pawn Sep 13, 2021, 2:57 AM

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Are you a fate fan mistersystem...

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I didnt need this lore

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😔

leaden torrent Sep 13, 2021, 3:01 AM

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ackshually melty blood is based on tsukihime

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which is just part of the same setting as fate (the "nasuverse")

blazing pawn Sep 13, 2021, 3:02 AM

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Every tsukihime fan that likes melty blood likes fate

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Literally all of them

leaden torrent Sep 13, 2021, 3:06 AM

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thats weird since tsukihime, unlike fate, is good

blazing pawn Sep 13, 2021, 3:08 AM

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Massive cope

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Its not

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KnK is the only good nasuverse property

leaden torrent Sep 13, 2021, 3:12 AM

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sorry you just have bad taste

blazing pawn Sep 13, 2021, 3:22 AM

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Considering what you think good taste is thats probably a good thing

leaden torrent Sep 13, 2021, 3:24 AM

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hey i know i like a lot of things that are objectively bad

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thats a different matter

blazing pawn Sep 13, 2021, 3:25 AM

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devilish

leaden torrent Sep 13, 2021, 3:28 AM

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apparently the remake is actually good too

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which is... surprising considering it was in development hell for 13 fucking years

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sadly itll probably never get translated

pale orchid Sep 13, 2021, 3:33 AM

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tsukihime is good

leaden torrent Sep 13, 2021, 3:33 AM

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jovial ember Sep 13, 2021, 5:52 AM

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Moth thinking meltyblood is a fate game

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Moth being completely wrong, what’s new

bronze pelican Sep 13, 2021, 10:17 AM

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This is not even radially symmetric

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Radially symmetric means it has a symmetry group consisting of rotations

bronze pelican Sep 13, 2021, 10:20 AM

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bronze pelican This is not even radially symmetric

But this board is not symmetric under 90 degree rotations...

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Like, rotations do not describe the full symmetry group here. You need reflections.

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Smh wikipedia

pale orchid Sep 13, 2021, 10:28 AM

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reflection isn't symmetric

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a 180° rotation is, tho

stoic ice Sep 13, 2021, 10:29 AM

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Doesn’t look symmetric about an axis to me

bronze pelican Sep 13, 2021, 10:30 AM

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Tfw 180 rotation is a reflection

pale orchid Sep 13, 2021, 10:30 AM

#

what?

#

are you on crack?

stoic ice Sep 13, 2021, 10:30 AM

#

No

bronze pelican Sep 13, 2021, 10:30 AM

#

stoic ice Sep 13, 2021, 10:30 AM

#

It is a reflection about the center of rotation

#

But not about any axis

#

Take playing cards for example

#

The cards with people

pale orchid Sep 13, 2021, 10:31 AM

#

show the reflection you mean, pt

stoic ice Sep 13, 2021, 10:32 AM

#

,w queen of diamonds

fathom swallowBOT Sep 13, 2021, 10:32 AM

#

Results provided by WolframAlpha

Click here to refine your query online
Upgrade to WolframAlpha Pro!

stoic ice Sep 13, 2021, 10:32 AM

#

Wtf?

#

I want a picture you stuoid wolfram

bronze pelican Sep 13, 2021, 10:32 AM

#

Point reflection opencry

stoic ice Sep 13, 2021, 10:32 AM

#

bronze pelican Point reflection <:opencry:586078614865444865>

Yeah but this doesn’t count as reflectional symmetry

#

🤷‍♂️

bronze pelican Sep 13, 2021, 10:33 AM

#

sully

#

Reflections generate the full isometry group of the plane

#

Rotations, translations and glide Reflections are all compositions of Reflections

stoic ice Sep 13, 2021, 10:36 AM

#

I don’t think composition work in symmetry

neat lintel Sep 13, 2021, 10:37 AM

#

Group theory doesn't work

#

Sorry bois

pale orchid Sep 13, 2021, 10:38 AM

#

pt memeing

bronze pelican Sep 13, 2021, 10:57 AM

#

sully

vivid halo Sep 13, 2021, 12:28 PM

#

dan

neat lintel Sep 13, 2021, 1:12 PM

#

sully

fervent bay Sep 13, 2021, 1:14 PM

#

hypersully

bronze pelican Sep 13, 2021, 1:30 PM

#

I was actually a much better student as a undergrad than I am in grad school now

#

opencry

stoic ice Sep 13, 2021, 1:52 PM

#

Makes sense

#

Grad should be harder innit?

sudden vapor Sep 13, 2021, 1:52 PM

#

Hello 👋

stoic ice Sep 13, 2021, 1:52 PM

#

Hi

sudden vapor Sep 13, 2021, 1:52 PM

#

Mmmm I need help I'm very much scared of maths

stoic ice Sep 13, 2021, 1:52 PM

#

How happy are you

stoic ice Sep 13, 2021, 1:53 PM

#

sudden vapor Mmmm I need help I'm very much scared of maths

Well, it doesn’t bite

sudden vapor Sep 13, 2021, 1:53 PM

#

And my fear is increasing

stoic ice Sep 13, 2021, 1:53 PM

#

Yeah that username is definitely a lie

sudden vapor Sep 13, 2021, 1:53 PM

#

Idk why buy i can't understand a single question

stoic ice Sep 13, 2021, 1:53 PM

#

sudden vapor Idk why buy i can't understand a single question

Only one question is troubling you?

neat lintel Sep 13, 2021, 1:53 PM

#

welcome to math server hope you enjoy your stay here

#

AK

stoic ice Sep 13, 2021, 1:53 PM

#

What math are you doing

#

Grade kg2?

sudden vapor Sep 13, 2021, 1:54 PM

#

Mmm 9 th grade

stoic ice Sep 13, 2021, 1:54 PM

#

For some reason my phone likes to autocorrect question to queen

stoic ice Sep 13, 2021, 1:54 PM

#

sudden vapor Mmm 9 th grade

#❓how-to-get-help and ping me in the channel you chose

uncut socket Sep 13, 2021, 1:55 PM

#

stoic ice What math are you doing

What about you? What math you doing?

stoic ice Sep 13, 2021, 1:55 PM

#

Ngl that’s one sussy question

#

Idk

#

Mech and calc atm

uncut socket Sep 13, 2021, 1:58 PM

#

Sounds awful

stoic ice Sep 13, 2021, 2:09 PM

#

Thanks

#

That was really nice of you

#

I’m entering uni

#

Engineering

#

So the math I know atm is some mech and calc 1 and 2

#

Some statistics too

neat lintel Sep 13, 2021, 2:10 PM

#

mech?

stoic ice Sep 13, 2021, 2:11 PM

#

Mechanics

#

You know?

#

Free body diagrams

#

Newton’s law of motion

#

Work-energy principle

#

Those stuff

neat lintel Sep 13, 2021, 2:12 PM

#

mathematical mechanics?

#

sounds like physics

stoic ice Sep 13, 2021, 2:12 PM

#

Lol true

#

But it’s math

neat lintel Sep 13, 2021, 2:12 PM

#

mathematical physics

stoic ice Sep 13, 2021, 2:12 PM

#

I took A level math

timid spindle Sep 13, 2021, 2:12 PM

#

stoic ice Free body diagrams

what engineering?

stoic ice Sep 13, 2021, 2:12 PM

#

It has mechanics

timid spindle Sep 13, 2021, 2:12 PM

#

seems like mechanical eng?

stoic ice Sep 13, 2021, 2:13 PM

#

I didn’t enter uni yet

#

But yeah I want aerospace

neat lintel Sep 13, 2021, 2:14 PM

#

did u take a level further math?

stoic ice Sep 13, 2021, 2:14 PM

#

I did

neat lintel Sep 13, 2021, 2:14 PM

#

or just math

#

lol i thought you're into pde stuff

stoic ice Sep 13, 2021, 2:14 PM

#

neat lintel lol i thought you're into pde stuff

I am 17 year old what are you talking about

neat lintel Sep 13, 2021, 2:14 PM

#

mk

stoic ice Sep 13, 2021, 2:14 PM

#

I didn’t take calc 3 yet

neat lintel Sep 13, 2021, 2:15 PM

#

suggest you read calculus on manifolds by spivak

stoic ice Sep 13, 2021, 2:15 PM

#

All I know about pde’s is that there is a triangle that does some stuff

stoic ice Sep 13, 2021, 2:15 PM

#

neat lintel suggest you read calculus on manifolds by spivak

Umm.. probably won’t thanks lol

neat lintel Sep 13, 2021, 2:15 PM

#

that's okay...

#

AK

stoic ice Sep 13, 2021, 2:16 PM

#

Okay gtg

neat lintel Sep 13, 2021, 2:16 PM

#

bye nkoHello

#

AK

outer lion Sep 13, 2021, 2:19 PM

#

neat lintel suggest you read calculus on manifolds by spivak

it requires knowledge on linear algebra right?

neat lintel Sep 13, 2021, 2:19 PM

#

yeah that's one of the prerequisites

#

AK

outer lion Sep 13, 2021, 2:20 PM

#

hmmCat

timid spindle Sep 13, 2021, 2:21 PM

#

most engineering math isn't that complicated

neat lintel Sep 13, 2021, 2:21 PM

#

what's engineering math? i only know pure math nkoGiggle

#

jk

timid spindle Sep 13, 2021, 2:22 PM

#

neat lintel what's engineering math? i only know pure math <a:nkoGiggle:879870322088771634>

umm algebra
algebra
and some more algebra

honest phoenix Sep 13, 2021, 2:22 PM

#

and some more more algebra

pale orchid Sep 13, 2021, 2:22 PM

#

linalg, multivar calc, elementary real and complex analysis, and cookbook pdes

#

some basic counting technics and stats, too

neat lintel Sep 13, 2021, 2:23 PM

#

different field has different pain

#

AK

pale orchid Sep 13, 2021, 2:23 PM

#

i would say those are the basics for most engineering courses

timid spindle Sep 13, 2021, 2:24 PM

#

I've never actually used derivatives in field work. It's all algebra in civil engineering.

timid spindle Sep 13, 2021, 2:25 PM

#

pale orchid i would say those are the basics for most engineering courses

mostly, electrical is a bit math intensive

#

but

neat lintel Sep 13, 2021, 2:25 PM

#

timid spindle umm algebra algebra and some more algebra

So algebra, commutative algebra, algebraic geometry...

timid spindle Sep 13, 2021, 2:25 PM

#

that's as good as it gets.

timid spindle Sep 13, 2021, 2:26 PM

#

neat lintel So algebra, commutative algebra, algebraic geometry...

nah, more like the algebra we study in high school. Rearranging equations and stuff.

honest phoenix Sep 13, 2021, 3:59 PM

#

same but little bit sticky

neat lintel Sep 13, 2021, 4:55 PM

#

stoic ice I am 17 year old what are you talking about

I was doing multi variable calc that time.

stoic ice Sep 13, 2021, 7:27 PM

#

Hi

deep mango Sep 13, 2021, 8:21 PM

#

neat lintel I was doing multi variable calc that time.

I was doing convex integration over cohomologous perfectoid spaces at that time.

errant rock Sep 13, 2021, 8:28 PM

#

i was learning to count

my sigma grindset kicked in much later

neat lintel Sep 13, 2021, 8:30 PM

#

A googologist in the making

stoic ice Sep 13, 2021, 11:02 PM

#

neat lintel I was doing multi variable calc that time.

Einstein mastered calculus by the age of 14

#

You better work on yourself more

neat lintel Sep 13, 2021, 11:03 PM

#

stoic ice Einstein mastered calculus by the age of 14

Says who?

stoic ice Sep 13, 2021, 11:03 PM

#

Yeah I was planning to study multi var in Summer but I got lazy lol

stoic ice Sep 13, 2021, 11:03 PM

#

neat lintel Says who?

Wdym?

#

Wikipedia lol

#

You mean where I got the info from?

neat lintel Sep 13, 2021, 11:04 PM

#

Yeah

#

Wait

#

I got him confused with Newton

stoic ice Sep 13, 2021, 11:04 PM

#

I think the the only reason school exists is the pressure not the teaching

#

Imagine mastering a subject before inventing it

#

It’d be super dope ngl

stoic ice Sep 13, 2021, 11:08 PM

#

stoic ice I think the the only reason school exists is the pressure not the teaching

I mean I don’t have the motive to learn anything on my own except if they tell me there are some unimportant numbers that are calculated based on how much I know the subject

neat lintel Sep 13, 2021, 11:09 PM

#

nice jojo pfp

stoic ice Sep 13, 2021, 11:13 PM

#

Lol thanks

neat lintel Sep 13, 2021, 11:15 PM

#

that might be the only anime I haven’t watched. The animation is a huge turnoff and I don’t understand why. I have watched other show with terrible animation.

#

its super good

#

i think the art style is awesome but i see why people feel indifferent to it

reef herald Sep 13, 2021, 11:50 PM

#

neat lintel Sep 13, 2021, 11:54 PM

#

bruh?

dusky quartz Sep 14, 2021, 2:39 AM

#

me trying to do integrals with three hours of sleep

rare pond Sep 14, 2021, 2:45 AM

#

Hello everyone, im trying to order a math textbook from the AMS bookstore. It wants me to make an account, but when I try it wants me to type my address and the drop down menu to select which state I’m in does not work. I have tried multiple OS/browser combinations. Very strange issue. Has anyone else has this issue or heard of anyone having this issue?

neat lintel Sep 14, 2021, 1:43 PM

#

stoic ice You better work on yourself more

Why should I care what Einstein did?

stoic ice Sep 14, 2021, 1:43 PM

#

The same reason you should ping me about sth happened before they invented time

neat lintel Sep 14, 2021, 1:45 PM

#

deep mango I was doing convex integration over cohomologous perfectoid spaces at that time.

Math is complex.

neat lintel Sep 14, 2021, 2:26 PM

#

neat lintel Math is complex.

well said bro

#

nice thing about math is that if your good at it you never be wrong

#

maths never wrong

neat lintel Sep 14, 2021, 2:33 PM

#

neat lintel nice thing about math is that if your good at it you never be wrong

No, just opposite. The better you get, you create more theories and make mistakes

#

hmm

#

u have a point

neat lintel Sep 14, 2021, 2:34 PM

#

neat lintel u have a point

Does a point point anything in math. I am confused.

#

ur confusing me

#

were both confused

deep mango Sep 14, 2021, 2:34 PM

#

sully

neat lintel Sep 14, 2021, 2:41 PM

#

What can a non math background person do with his math knowledge?

#

add on his fingers

neat lintel Sep 14, 2021, 2:42 PM

#

neat lintel add on his fingers

What to add?

#

numbers

#

counting on fingers better said

neat lintel Sep 14, 2021, 2:42 PM

#

neat lintel numbers

Which type

neat lintel Sep 14, 2021, 2:43 PM

#

neat lintel counting on fingers better said

Is it complex numbers?

#

no

neat lintel Sep 14, 2021, 2:47 PM

#

neat lintel no

Natural numbers?

#

yes

surreal sapphire Sep 14, 2021, 2:52 PM

#

neat lintel What can a non math background person do with his math knowledge?

lots of professions need at least some mathematics, all kinds of tradesmen need to be comfortable with fractions and trig, office jobs juggle spreadsheets all day, which obviously needs math as well

#

generally the word mathematics in ancient greek means something like "the art of learning", so there is also the idea that teaching people mathematics helps them reason better about anything

pale orchid Sep 14, 2021, 3:13 PM

#

as an example, i'm a "non math background person" who uses math to both offend everyone by being bad at it and to make nice ultrasound, x ray, radar, etc. images

neat lintel Sep 14, 2021, 3:34 PM

#

pale orchid as an example, i'm a "non math background person" who uses math to both offend e...

So you are a hospital lab assistant?

pale orchid Sep 14, 2021, 3:35 PM

#

not at all

#

i do signal processing

neat lintel Sep 14, 2021, 3:35 PM

#

pale orchid i do signal processing

This reminds me of a book
Digital Signal Processing: Principles, Algorithms and Applications
John G Proakis

pale orchid Sep 14, 2021, 3:35 PM

#

that's code for needing a masters and phd to be bad at statistics and linalg

velvet dagger Sep 14, 2021, 3:53 PM

#

What if you're good at them? :0

#

You just need a bachelor's?

analog salmon Sep 14, 2021, 4:32 PM

#

I saw someone with the hot take earlier that in the future, we'll be teaching Groebner Bases to undergrads like we teach them Gaussian elimination

#

very hot take

odd narwhal Sep 14, 2021, 4:51 PM

#

So hot it reached negative kelvin

vivid halo Sep 14, 2021, 6:43 PM

#

don't lol

vast surge Sep 14, 2021, 6:44 PM

#

Cool thanks I won't.

swift steeple Sep 14, 2021, 7:15 PM

#

toddlers can totally handle topology and algebraic structures and group theory
and babies can handle vector calculus and linear algebra and trigonometry
which implies kindergartners are doing vertex algebra and more abstract mathematics
and late on kindergarten, they would get Ph.D's
by 1st grade, they would be professors
or do research

#

before teaching addition, i force 2 year olds to study peano axioms, zermelo-fraenkel axioms, number fields and field extensions, etc.

#

after all...

surreal sapphire Sep 14, 2021, 7:16 PM

#

memes go in #chill

swift steeple Sep 14, 2021, 7:16 PM

#

too much mathematical rigor and abstraction is healthy for children

#

they need it to grow their tiny brains

#

also if it traumatizes them or smth, i'm not responsible

#

they need it

velvet dagger Sep 14, 2021, 7:44 PM

#

What novelty

dry copper Sep 14, 2021, 9:22 PM

#

Hyuck

sick burrow Sep 15, 2021, 3:26 AM

#

personally I don't think we should teach kids how to add until they know enough set theory to rigorously construct ordinal addition from the ZFC axioms

bronze pelican Sep 15, 2021, 3:27 AM

#

personally

sick burrow Sep 15, 2021, 3:27 AM

#

deep mango Sep 15, 2021, 3:47 AM

#

Nothing personnelly kid.

sick burrow Sep 15, 2021, 4:04 AM

#

construct the naturals in analysis 1

#

what kind of analysis 1 class did you take Ultra

#

who constructs the naturals in analysis 1

#

at best you construct the real numbers

#

but what kind of analysis class isn't taking the naturals for granted

#

you don't

#

you're just given the naturals

#

ok just so we're clear

leaden torrent Sep 15, 2021, 4:06 AM

#

constructing them is literally like

#

5 axioms

sick burrow Sep 15, 2021, 4:06 AM

#

when you say analysis you mean the branch of math that covers the properties of the real numbers and functions on them and integrals and stuff

leaden torrent Sep 15, 2021, 4:07 AM

#

depending on how you count

#

4 of them are super simple and 1 is induction

sick burrow Sep 15, 2021, 4:07 AM

#

not set theory

leaden torrent Sep 15, 2021, 4:07 AM

#

shush

#

showing N satisfies the axioms is easy

#

you know what i mean

sick burrow Sep 15, 2021, 4:07 AM

#

where are you getting N from

#

how do you know sets even exist

leaden torrent Sep 15, 2021, 4:08 AM

#

my analysis courses never constructed R but they certainly axiomatized and then constructed N

sick burrow Sep 15, 2021, 4:08 AM

#

my analysis course did neither

leaden torrent Sep 15, 2021, 4:08 AM

#

the von neumann ordinals were mentioned in an aside

sick burrow Sep 15, 2021, 4:08 AM

#

but my analysis course was also shit

#

didn't even cover integrals

leaden torrent Sep 15, 2021, 4:08 AM

#

you dont know sets exist, theyre a primitive

sick burrow Sep 15, 2021, 4:08 AM

#

barely covered derivatives

leaden torrent Sep 15, 2021, 4:08 AM

#

er

#

let me rephrase

#

you know they exist because theyre a primitive

#

no it only shows their existence is consistent ultra

#

god

sick burrow Sep 15, 2021, 4:09 AM

#

no but when I say

#

personally I don't think we should teach kids how to add until they know enough set theory to rigorously construct ordinal addition from the ZFC axioms

#

I'm talking like Principia Mathematica kinda stuff

#

not just Peano axioms lol done

leaden torrent Sep 15, 2021, 4:10 AM

#

i mean if youre using zfc its not hard either

#

principia is not zfc

#

principia is a lot more involved

sick burrow Sep 15, 2021, 4:10 AM

#

well that's what I mean

#

zfc is easy mode

#

constructing them from zfc is for the remedial students

#

the advanced students need to start by rederiving language

leaden torrent Sep 15, 2021, 4:11 AM

#

i was reading Russell the other day and he used the word "set". i was like, daddy russell, how could you do this to me? your theory's supposed to be a type-theory-kinda-except-not-really! was what i read from a programmer's blog on HoTT wrong???

#

i figured my sarcastic tone would be fairly clear

#

should i have added more exclamation marks

#

perhaps a :smug:

#

oh no i forgot, discord stole my goddamn :smug:

#

im quitting this platform

#

does parler have :smug:

sick burrow Sep 15, 2021, 4:15 AM

#

sonic sentinel Sep 15, 2021, 4:36 AM

#

The existence of God only implies the existence of God.

leaden torrent Sep 15, 2021, 4:44 AM

#

sonic sentinel *The existence of God only implies the existence of God.*

https://cpb-us-w2.wpmucdn.com/u.osu.edu/dist/1/1952/files/2014/01/ConMathThe122512-1iea8ps.pdf

#

God → Con(ZFC)

#

(here "god" means in godels ontological sense)

#

the paper, despite the ??? typesetting and cranky claim

sick burrow Sep 15, 2021, 4:44 AM

#

(the stupid sense)

leaden torrent Sep 15, 2021, 4:44 AM

#

is legit

#

which is absolutely hilarious

#

#

honestly im in the wrong field

#

i dont get to call anything

#

"divine"

#

all my adjectives are boring

neat lintel Sep 15, 2021, 4:51 AM

#

The Final Proof of the non-Existence of God was proved by a Babel Fish.

Now, it is such a bizarrely improbable coincidence that anything so mind-bogglingly useful could have evolved purely by chance that some have chosen to see it as the final proof of the NON-existence of God. The argument goes something like this:

"I refuse to prove that I exist," says God, "for proof denies faith, and without faith I am nothing."

"But," says Man, "the Babel fish is a dead giveaway, isn't it? It could not have evolved by chance. It proves that You exist, and so therefore, by Your own arguments, You don't. QED."

"Oh dear," says God, "I hadn't thought of that," and promptly vanishes in a puff of logic.

"Oh, that was easy," says Man, and for an encore goes on to prove that black is white and gets himself killed on the next zebra crossing.

pearl escarp Sep 15, 2021, 12:21 PM

#

neat lintel > The Final Proof of the non-Existence of God was proved by a Babel Fish. > > N...

Is that from hitchhiker's guide?
If yes then I definitely have to read that again

deep mango Sep 15, 2021, 12:23 PM

#

It's very good

#

I have the full thing sitting right there on my shelf

toxic schooner Sep 15, 2021, 12:23 PM

#

pandaWow

neat lintel Sep 15, 2021, 12:51 PM

#

pearl escarp Is that from hitchhiker's guide? If yes then I definitely have to read that agai...

yes

sick burrow Sep 15, 2021, 2:42 PM

#

I just started rereading Hitchhiker's Guide a few weeks ago and yes it is very good

neat lintel Sep 15, 2021, 4:40 PM

#

sick burrow I just started rereading Hitchhiker's Guide a few weeks ago and yes it is very g...

What's it?

sick burrow Sep 15, 2021, 4:41 PM

#

it's a book series

neat lintel Sep 15, 2021, 4:41 PM

#

Math?

untold sapphire Sep 15, 2021, 5:04 PM

#

no lol it's just comedy

#

humor

neat lintel Sep 15, 2021, 5:09 PM

#

That 42 thingy?

untold sapphire Sep 15, 2021, 5:12 PM

#

yeah, that's the book.

quiet geode Sep 15, 2021, 5:19 PM

#

Is it ok to ask questions here?

fringe needle Sep 15, 2021, 5:19 PM

#

#❓how-to-get-help

quiet geode Sep 15, 2021, 5:20 PM

#

Not exactly a question tbh

#

Theoretical query

cold needle Sep 15, 2021, 5:22 PM

#

???

quiet geode Sep 15, 2021, 5:23 PM

#

neat lintel Sep 15, 2021, 5:24 PM

#

quiet geode

??

quiet geode Sep 15, 2021, 5:24 PM

#

What

neat lintel Sep 15, 2021, 5:25 PM

#

What are you asking?

cold needle Sep 15, 2021, 5:25 PM

#

i feel like this book is familiar

quiet geode Sep 15, 2021, 5:25 PM

#

Im yet to disclose that

quiet geode Sep 15, 2021, 5:25 PM

#

cold needle i feel like this book is familiar

Apostol lol

#

So

#

I wanted to know how introducing another variable 'b' makes the case "particular"

#

Like how is it different from choosing an arbitrary point 'x'?

#

Is this not the right channel to do that?

cold needle Sep 15, 2021, 5:28 PM

#

this is not the right channel

#

read #❓how-to-get-help

quiet geode Sep 15, 2021, 5:29 PM

#

Well ok

#

I thought #questions was all about asking problems from exercises

neat lintel Sep 15, 2021, 5:30 PM

#

My response is not getting displayed I think.

quiet geode Sep 15, 2021, 5:30 PM

#

It is not

neat lintel Sep 15, 2021, 5:31 PM

#

@cold needle : What's the red color coming across my response.
Am I muted?

#

it means your message didnt send

#

try resending

neat lintel Sep 15, 2021, 5:32 PM

#

quiet geode Like how is it different from choosing an arbitrary point 'x'?

I think it's just like x, but b is the length of the box.

cold needle Sep 15, 2021, 5:32 PM

#

yeah must be some internet issue

neat lintel Sep 15, 2021, 5:32 PM

#

discord is a piece of shit app that likes to stop messages from sending every once in a while

quiet geode Sep 15, 2021, 5:32 PM

#

Network issues

cold needle Sep 15, 2021, 5:32 PM

#

#

lmao

neat lintel Sep 15, 2021, 5:32 PM

#

spanish

quiet geode Sep 15, 2021, 5:33 PM

#

neat lintel I think it's just like x, but b is the length of the box.

Box?

cold needle Sep 15, 2021, 5:33 PM

#

spanish

neat lintel Sep 15, 2021, 5:33 PM

#

quiet geode Box?

Rectangle

#

spanish

#

Are spanish ppl are called Spaniards?

quiet geode Sep 15, 2021, 5:34 PM

#

So whats the point of saying that?

#

No

#

Theyre called spinach

neat lintel Sep 15, 2021, 5:34 PM

#

quiet geode So whats the point of saying that?

It's the limit of the rectangle.

quiet geode Sep 15, 2021, 5:36 PM

#

How does that makes it "in particular"

neat lintel Sep 15, 2021, 5:36 PM

#

quiet geode How does that makes it "in particular"

There is nothing special about 'b'

#

Sorry, discord making me do more mouse moves.

pale orchid Sep 15, 2021, 5:37 PM

#

metal spaniard moment

#

i didn't know

quiet geode Sep 15, 2021, 5:38 PM

#

Ok

cold needle Sep 15, 2021, 5:40 PM

#

i am indian

#

i dont

#

i just

#

spanish

#

yea

#

dont worry about it

pale orchid Sep 15, 2021, 5:40 PM

#

visible concern

neat lintel Sep 15, 2021, 5:40 PM

#

stare

#

actually metal, i will not worry about it. i will respect your boundaries and inquire no further

pale orchid Sep 15, 2021, 5:40 PM

#

ninja metálico veintisiete

quiet geode Sep 15, 2021, 5:47 PM

#

Meow

devout nacelle Sep 15, 2021, 5:56 PM

#

uhhhh

quiet geode Sep 15, 2021, 5:58 PM

#

Feels like breaking the rules is way more convenient way to get your queries resolved

pale orchid Sep 15, 2021, 6:00 PM

#

or banned

sick burrow Sep 15, 2021, 6:00 PM

#

then you just come back with an alt

#

that's what Namington does

#

except he does it even when he doesn't get banned

#

fun fact: half of this server is just Namington alts

quiet geode Sep 15, 2021, 6:01 PM

#

Bro that was just an honest feedback

neat lintel Sep 15, 2021, 6:07 PM

#

sick burrow fun fact: half of this server is just Namington alts

I am not

sick burrow Sep 15, 2021, 6:08 PM

#

suure

devout nacelle Sep 15, 2021, 6:15 PM

#

quiet geode Feels like breaking the rules is way more convenient way to get your queries res...

It is not. uhhhh Your best bet is to follow the rules, show your effort at solving, co-operate if someone is trying to help. At the end it has to be acknowledged that everyone helping here is a volunteer, so there can simply be times where no one helps.

neat lintel Sep 15, 2021, 6:29 PM

#

cold needle spanish

NinjaMetálico27

cold needle Sep 15, 2021, 6:29 PM

#

trueeee

pale orchid Sep 15, 2021, 6:30 PM

#

ciertoooo

thorn brook Sep 15, 2021, 6:42 PM

#

ninja-de-metal27

neat lintel Sep 15, 2021, 6:43 PM

#

toki mfkin doki

pale orchid Sep 15, 2021, 6:43 PM

#

toki-de-doki

thorn brook Sep 15, 2021, 6:44 PM

#

ed-d-de

quiet geode Sep 15, 2021, 6:57 PM

#

Petition to gib sat_3 server owner

neat lintel Sep 15, 2021, 6:58 PM

#

sully

#

How do I bcm a Mod?

#

sully

quiet geode Sep 15, 2021, 6:59 PM

#

Guy managed to understand my bullshittery without losing their temper

magic meadow Sep 15, 2021, 7:46 PM

#

sick burrow fun fact: half of this server is just Namington alts

I did not know that pandaHmm

compact tartan Sep 15, 2021, 7:51 PM

#

neat lintel How do I bcm a Mod?

study a field of math you hate for 6 months

sick burrow Sep 15, 2021, 8:08 PM

#

magic meadow I did not know that <:pandaHmm:858834883760750602>

Says the Namington alt

blazing pawn Sep 15, 2021, 8:20 PM

#

Moment

neat lintel Sep 15, 2021, 8:53 PM

#

compact tartan study a field of math you hate for 6 months

Topology 😫

crystal stone Sep 15, 2021, 9:52 PM

#

neat lintel Topology 😫

That's where you're wrong bucko

crystal stone Sep 15, 2021, 9:52 PM

#

compact tartan study a field of math you hate for 6 months

I did a semester of algebraic curves

#

Does that count

vast surge Sep 15, 2021, 9:52 PM

#

Algebraic curves sounds fun though

crystal stone Sep 15, 2021, 9:53 PM

#

Yeah but I hate algebra

vast surge Sep 15, 2021, 9:53 PM

#

crystal stone Sep 15, 2021, 9:53 PM

#

Algebraic curves made it bareable

#

Don't you sully me

deep mango Sep 15, 2021, 9:53 PM

#

bleak

crystal stone Sep 15, 2021, 9:53 PM

#

This is well-known in the discord

#

That I'm not a big fan of abstract algebra

vast surge Sep 15, 2021, 9:53 PM

#

I am aware. It is still sully.

crystal stone Sep 15, 2021, 9:53 PM

#

Sylow Theorems are awful

fervent bay Sep 15, 2021, 9:54 PM

#

i agree

crystal stone Sep 15, 2021, 9:54 PM

#

Classify all groups of order xyz

#

Wow how fun

#

I sure am learning a lot of math!

vast surge Sep 15, 2021, 9:55 PM

#

You do like three of those exercises and then move on to more interesting stuff.

crystal stone Sep 15, 2021, 9:55 PM

#

Algebra is only fun when some other subject is tossed in

#

Like topology

#

I more or less think the same thing about real analysis, it's only fun with fourier/PDEs

vast surge Sep 15, 2021, 9:56 PM

#

You know that's fair half the reason I like algebra is that using algebraic methods to solve problems from elsewhere is just really cool.

crystal stone Sep 15, 2021, 9:56 PM

#

But Complex makes real more bareable

#

Also Algebraic Geometry is so cool

#

I wish I understood it

#

Why do you Sully me Ryc

vast surge Sep 15, 2021, 9:56 PM

#

I'm reading Cox, Little, O'Shea right now and it's a super accessible intro to AG and commalg.

deep mango Sep 15, 2021, 9:57 PM

#

moonbears crank reveal

crystal stone Sep 15, 2021, 9:57 PM

#

I read through Fulton's algebraic curves

deep mango Sep 15, 2021, 9:57 PM

#

real analysis bad sotrue

crystal stone Sep 15, 2021, 9:57 PM

#

and did some stuff on Riemann Surfaces

#

I don't think it's bad

#

I just think it's kinda dry

vast surge Sep 15, 2021, 9:57 PM

#

Oh okay yeah that's a bit more advanced AG than what I'm doing now.

crystal stone Sep 15, 2021, 9:57 PM

#

At the intro level

#

Kinda like point-set topology is bleck

vast surge Sep 15, 2021, 9:57 PM

#

All math is slightly dry at the intro level, at least compared to the upper levels.

crystal stone Sep 15, 2021, 9:58 PM

#

I tried reading my final project for topology today

#

My head hurt

vast surge Sep 15, 2021, 9:58 PM

#

Other than real analysis. The best parts of that course are when you spend the first few lectures screwing around with Dedekind cuts, the most fun and intuitive construction in all of mathematics.

crystal stone Sep 15, 2021, 9:58 PM

#

How tf did I write that

wild jay Sep 15, 2021, 9:58 PM

#

yy

crystal stone Sep 15, 2021, 9:58 PM

#

vast surge Other than real analysis. The best parts of that course are when you spend the f...

I think the most fund I had in real was when we got to fourier

#

And did some special function stuff

#

Then applying it to number theory (in a different course)

#

Was a lot of fun

#

I'm TA-ing for point-set topology at my university right now

#

The professor took topology back in 1995, and hasn't touched it since

vast surge Sep 15, 2021, 10:00 PM

#

That sounds like hell.

crystal stone Sep 15, 2021, 10:00 PM

#

So she's havin' a hard time

crystal stone Sep 15, 2021, 10:00 PM

#

vast surge That sounds like hell.

It's kinda fun

#

I had to take point-set topology 3 times

#

well, I choose it once when I shouldn't've

cinder roost Sep 15, 2021, 10:33 PM

#

crystal stone I had to take point-set topology 3 times

what even is that, if you don't mind

crystal stone Sep 15, 2021, 10:33 PM

#

https://en.wikipedia.org/wiki/General_topology

General topology

In mathematics, general topology is the branch of topology that deals with the basic set-theoretic definitions and constructions used in topology. It is the foundation of most other branches of topology, including differential topology, geometric topology, and algebraic topology. Another name for general topology is point-set topology.
The funda...

cinder roost Sep 15, 2021, 10:34 PM

#

it be difficult?

crystal stone Sep 15, 2021, 10:34 PM

#

I suppose that's up to you

cinder roost Sep 15, 2021, 10:34 PM

#

well, isn't almost everything in that case

crystal stone Sep 15, 2021, 10:34 PM

#

Yes

latent forge Sep 15, 2021, 10:54 PM

#

astonishing

#

does anyone have any stories about a time someone in humanities major surprised you?

swift steeple Sep 15, 2021, 11:04 PM

#

crystal stone Yeah but I hate algebra

high school algebra or abstract algebra?

#

abstract algebra is OP and good

crystal stone Sep 15, 2021, 11:05 PM

#

I'll let you decide for that one

swift steeple Sep 15, 2021, 11:05 PM

#

i'll assume abstract algebra

#

because who tf likes high school lvl math?

crystal stone Sep 15, 2021, 11:05 PM

#

I like it

swift steeple Sep 15, 2021, 11:06 PM

#

crystal stone I like it

https://tenor.com/view/sebastian-maniscalco-maniscalco-wth-sebastian-what-the-hell-gif-15545272

Tenor

crystal stone Sep 15, 2021, 11:06 PM

#

I enjoy HS lvl math, and working with students through it

swift steeple Sep 15, 2021, 11:06 PM

#

crystal stone I enjoy HS lvl math, and working with students through it

to me, high school math is too cringe

#

because no interesting stuff

#

and also because it's basic

crystal stone Sep 15, 2021, 11:07 PM

#

I think there's a lot more to it

#

Than you'd firs tthink

swift steeple Sep 15, 2021, 11:07 PM

#

like what? complex numbers?

#

calculus?

crystal stone Sep 15, 2021, 11:07 PM

#

No, even factoring quadratics

#

Is interesting

jaunty gate Sep 15, 2021, 11:08 PM

#

Id have to disagree with you on that MoonBears

crystal stone Sep 15, 2021, 11:08 PM

#

It's ok to be wrong

#

And you're both in the wrong here

jaunty gate Sep 15, 2021, 11:08 PM

#

Do you enjoy repetitive menial tasks?

swift steeple Sep 15, 2021, 11:08 PM

#

factoring quadratics is just doing something to get the solution(s) or prove something

#

it's boring

#

and has no other purpose imo

crystal stone Sep 15, 2021, 11:09 PM

#

Hrm, and have you taught factoring quadratics?

jaunty gate Sep 15, 2021, 11:09 PM

#

Yeah

crystal stone Sep 15, 2021, 11:09 PM

#

Have you learned the historical development

crystal stream Sep 15, 2021, 11:09 PM

#

why do teachers who work with high school students spend so much time on quadratics

#

like

swift steeple Sep 15, 2021, 11:09 PM

#

crystal stone Hrm, and have you taught factoring quadratics?

yes i suck at teaching

crystal stream Sep 15, 2021, 11:09 PM

#

just complete the square lol

jaunty gate Sep 15, 2021, 11:09 PM

#

Iv'e done a fair bit of teaching

crystal stone Sep 15, 2021, 11:09 PM

#

crystal stream just complete the square lol

Where did the equals sign come from

jaunty gate Sep 15, 2021, 11:09 PM

#

/tutoring

swift steeple Sep 15, 2021, 11:09 PM

#

crystal stream why do teachers who work with high school students spend so much time on quadrat...

idk because 60% of algebra is quadratics

crystal stone Sep 15, 2021, 11:09 PM

#

How does it lead into modern mathematics?

crystal stream Sep 15, 2021, 11:10 PM

#

lemme actually

#

look that up real quick

swift steeple Sep 15, 2021, 11:10 PM

#

crystal stone Where did the equals sign come from

it's a sign ppl made up

#

= is =

jaunty gate Sep 15, 2021, 11:10 PM

#

My enjoyment of math doesn't come from repetitive tasks, it comes from having to think/find a solution

crystal stone Sep 15, 2021, 11:10 PM

#

I think it's interesting to think about

jaunty gate Sep 15, 2021, 11:10 PM

#

Highschool maths for the most part is the first part

swift steeple Sep 15, 2021, 11:10 PM

#

jaunty gate My enjoyment of math doesn't come from repetitive tasks, it comes from having to...

same and also abstract math

#

and ideas

crystal stone Sep 15, 2021, 11:10 PM

#

How many different ways can you solve the same problem, how many ways can you interpret it

swift steeple Sep 15, 2021, 11:10 PM

#

and proofs

crystal stream Sep 15, 2021, 11:10 PM

#

According to the VNR Concise Encyclopedia of Mathematics, the equal sign was invented by Robert Recorde, the Royal Court Physician for England's King Edward VI and Queen Mary. Recorde, who lived from 1510 to 1558, was the most influential Welsh mathematician of his day and, among other things, introduced algebra to his countrymen

jaunty gate Sep 15, 2021, 11:10 PM

#

Proofs require thought

#

Often collaboration

swift steeple Sep 15, 2021, 11:11 PM

#

jaunty gate Proofs require thought

and creativity

crystal stream Sep 15, 2021, 11:11 PM

#

crystal stone How many different ways can you solve the same problem, how many ways can you in...

That's the only reason I can think of we teach students 400 different methods of factoring quadratics

#

but tbh there are more interesting problems where that principle can be applied

swift steeple Sep 15, 2021, 11:11 PM

#

crystal stone How many different ways can you solve the same problem, how many ways can you in...

many

crystal stone Sep 15, 2021, 11:11 PM

#

And they tie into different parts of Math

#

It's interesting to think about

#

How much is embedded in so little

swift steeple Sep 15, 2021, 11:12 PM

#

crystal stream ``` According to the VNR Concise Encyclopedia of Mathematics, the equal sign was...

i'm not an expert in mathematical history lol

#

or history in general

crystal stream Sep 15, 2021, 11:12 PM

#

solving something that could be done with a calculator or with a formula doesn't seem particularly motivating for a student that does't already love math

crystal stone Sep 15, 2021, 11:12 PM

#

That's why I try to motivate it when I lecture

crystal stream Sep 15, 2021, 11:12 PM

#

I mean, I find it cool, but most don't

swift steeple Sep 15, 2021, 11:12 PM

#

crystal stream solving something that could be done with a calculator or with a formula doesn't...

unless you prove or derive the formula

#

then it gets interesting

crystal stone Sep 15, 2021, 11:13 PM

#

I try to make it more natural, where the answers/questions arise naturally from examples

crystal stream Sep 15, 2021, 11:13 PM

#

I tend to do derivations when teaching

#

but I work with friends my age

crystal stone Sep 15, 2021, 11:13 PM

#

It's like crafting a historical narrative

crystal stream Sep 15, 2021, 11:13 PM

#

who are already at university and give more fucks

crystal stone Sep 15, 2021, 11:13 PM

#

I have to lecture 8 hours a week at a university for the remedial algebra

swift steeple Sep 15, 2021, 11:13 PM

#

i usually require proofs and use too much abstraction and mathematical rigor lol

crystal stone Sep 15, 2021, 11:13 PM

#

I have great freedom in what I do, so I get to have fun with it

swift steeple Sep 15, 2021, 11:13 PM

#

no wonder i'm bad at teaching

jaunty gate Sep 15, 2021, 11:14 PM

#

I don't teach the way i'd like to be taught

#

Doesn't work

crystal stone Sep 15, 2021, 11:14 PM

#

You have to motivate the proofs or the techniques - you have to pull them in with leading questions

latent forge Sep 15, 2021, 11:14 PM

#

is remedial an insult

crystal stone Sep 15, 2021, 11:14 PM

#

And it ties back in to other parts of math they already know

swift steeple Sep 15, 2021, 11:14 PM

#

jaunty gate I don't teach the way i'd like to be taught

i don't like math in school. i'm ok being lectured by a professor but not by school teachers

latent forge Sep 15, 2021, 11:15 PM

#

a big word to mean slow

#

or is it different meaning

#

ive only seen it twice

crystal stone Sep 15, 2021, 11:15 PM

#

latent forge a big word to mean slow

everything's an insult if you're easily offended. remedial algebra is exactly what it is

#

Sorry they didn't pass it the first three times

#

Or maybe they did but didn't learn

latent forge Sep 15, 2021, 11:15 PM

#

oh it says for learning difficulties people

#

where are remedial analysis classes when you need them

crystal stone Sep 15, 2021, 11:16 PM

#

I have freshman that can't add 1/2 + 1/3

latent forge Sep 15, 2021, 11:17 PM

#

its not uncommon

crystal stone Sep 15, 2021, 11:17 PM

#

Freshman at a university

latent forge Sep 15, 2021, 11:17 PM

#

im going to go out on a limb and say half the population cant do that

#

world population

swift steeple Sep 15, 2021, 11:17 PM

#

and i'm wondering. why aren't schools letting Ph.D's and actual experts teach? why can't mathematicians teach school for kids?

latent forge Sep 15, 2021, 11:17 PM

#

they probably dont apply to those jobs

crystal stone Sep 15, 2021, 11:17 PM

#

swift steeple and i'm wondering. why aren't schools letting Ph.D's and actual experts teach? w...

Because most mathematicians are bad at teaching

swift steeple Sep 15, 2021, 11:17 PM

#

crystal stone I have freshman that can't add 1/2 + 1/3

WTH LMAOOOOOOOO

crystal stone Sep 15, 2021, 11:17 PM

#

And have no training in being a teacher

latent forge Sep 15, 2021, 11:17 PM

#

swift steeple WTH LMAOOOOOOOO

y u laf

#

ask your mom

swift steeple Sep 15, 2021, 11:17 PM

#

crystal stone Because most mathematicians are bad at teaching

so? i don't care

latent forge Sep 15, 2021, 11:17 PM

#

she probably cant do it

#

moonbears

crystal stream Sep 15, 2021, 11:18 PM

#

i'm not sure how good terry would be at teaching high school students

latent forge Sep 15, 2021, 11:18 PM

#

troll spotted

crystal stream Sep 15, 2021, 11:18 PM

#

probably pretty good

crystal stone Sep 15, 2021, 11:18 PM

#

Terry's pretty good actually

#

He was very nice in office hours

latent forge Sep 15, 2021, 11:18 PM

#

who terry

crystal stone Sep 15, 2021, 11:18 PM

#

Terry Tao

swift steeple Sep 15, 2021, 11:18 PM

#

latent forge who terry

terence tao

#

field medalist

#

12-13 year old IMO gold medalist

#

math professor at UCLA

crystal stone Sep 15, 2021, 11:19 PM

#

Bill Thurston was on some math outreach journal thing

crystal stream Sep 15, 2021, 11:19 PM

#

i've watched a lecture of his about primes

jaunty gate Sep 15, 2021, 11:19 PM

#

crystal stone Because most mathematicians are bad at teaching

I wouldn't limit that to mathmaticians

#

Just because you're good at something doesn't mean you are a decent teacher for it

crystal stone Sep 15, 2021, 11:19 PM

#

I'm not limiting it to that, I'm just addressing the issue in having mathematicians teach grade school and up

latent forge Sep 15, 2021, 11:19 PM

#

Most people trained professionals arent trained at explaining

jaunty gate Sep 15, 2021, 11:19 PM

#

People often mistake the two

swift steeple Sep 15, 2021, 11:20 PM

#

crystal stone And have no training in being a teacher

why do schools require education credentials?

#

makes no sense

latent forge Sep 15, 2021, 11:20 PM

#

moonbears he is trolling

deep mango Sep 15, 2021, 11:20 PM

#

hmmCat

swift steeple Sep 15, 2021, 11:20 PM

#

just let experts teach

latent forge Sep 15, 2021, 11:20 PM

#

pls dont take bait

crystal stone Sep 15, 2021, 11:20 PM

#

I'm against teachers licenses also

deep mango Sep 15, 2021, 11:20 PM

#

Terry taos teaching is fine but i wouldnt say its amazing

#

He's very fast and frantic

crystal stone Sep 15, 2021, 11:20 PM

#

||The best math professors I've had are at CSULB||

latent forge Sep 15, 2021, 11:20 PM

#

deep mango He's very fast and frantic

for you smugsmug

crystal stone Sep 15, 2021, 11:20 PM

#

Those guys are fucking amazing at teaching

#

No terry rushes a lot of things

stark kraken Sep 15, 2021, 11:21 PM

#

I need help

#

what's the subset of an irrational number

deep mango Sep 15, 2021, 11:21 PM

#

He just lectures like he's trying to get somewhere

swift steeple Sep 15, 2021, 11:21 PM

#

deep mango He's very fast and frantic

no, he's still too slow... it needs more mathematical rigor and abstractness

deep mango Sep 15, 2021, 11:21 PM

#

stark kraken I need help

#❓how-to-get-help

latent forge Sep 15, 2021, 11:21 PM

#

stark kraken what's the subset of an irrational number

{sqrt2}

crystal stone Sep 15, 2021, 11:21 PM

#

This was my topology professor @deep mango

#

https://www.ratemyprofessors.com/ShowRatings.jsp?tid=1838335

Ryan Blair at California State University Long Beach - RateMyProfes...

Check out the ratings and reviews for Ryan Blair from California State University Long Beach in Long Beach, CA

#

Look at these reviews

#

They are ridiculous

stark kraken Sep 15, 2021, 11:21 PM

#

latent forge {sqrt2}

??

deep mango Sep 15, 2021, 11:22 PM

#

Aww, that's nice

crystal stone Sep 15, 2021, 11:23 PM

#

This was my algebraic curves prof

#

https://www.ratemyprofessors.com/ShowRatings.jsp?tid=317271

Will Murray at California State University Long Beach - RateMyProfe...

Check out the ratings and reviews for Will Murray from California State University Long Beach in Long Beach, CA

#

This was PDEs - the first review is hilarious

#

https://www.ratemyprofessors.com/ShowRatings.jsp?tid=1948628

James von Brecht at California State University Long Beach - RateMy...

Check out the ratings and reviews for James von Brecht from California State University Long Beach in Long Beach, CA

#

Professor VB is a cold stone fox. Very attractive man with his smooth, soft face. Despite his gray/white hair, he is a total babe. (Maybe in his mid 30s?) His personality at first seems cold and isolate to student but as the time progress, he started to show his bright side by started telling his funny/ embarrassed stories. Love that professor!

#

These guys were like at the pinnacle of teaching

crystal stone Sep 15, 2021, 11:25 PM

#

deep mango He's very fast and frantic

I think Terry is better at office hours

#

Than he is lecturing

#

Cuz then you can ask questions, get one on one help and see how to solve problems

deep mango Sep 15, 2021, 11:26 PM

#

yeah he was really good talking one on one

#

a lot less frantic

#

i was expecting it to be like a bulldozer

crystal stone Sep 15, 2021, 11:27 PM

#

He just has too much planned for each lecture

#

I think he structures his classes so that office hours are almost necessary

crystal stream Sep 15, 2021, 11:27 PM

#

he sounds really excited when he talks

#

or maybe that was just on that one video

crystal stone Sep 15, 2021, 11:27 PM

#

No, he goes very fast

#

At least he did in 246C

crystal stream Sep 15, 2021, 11:28 PM

#

https://www.youtube.com/watch?v=pp06oGD4m00&t=2129s

YouTube

UCLA

Terry Tao, Ph.D. Small and Large Gaps Between the Primes

UCLA Department Of Mathematics
Terry Tao, Ph.D. Small and Large Gaps Between the Primes

▶ Play video

crystal stone Sep 15, 2021, 11:28 PM

#

I heard his Fluids class was ridiculous

mellow moon Sep 16, 2021, 1:03 AM

#

In which sense

neat lintel Sep 16, 2021, 5:18 AM

#

I am planning to take up a challenge to excel in a math field in 6 month.
What do you suggest, if I can give 2 hours a day? 🙂

#

I am a good grasper.

wicked ore Sep 16, 2021, 5:20 AM

#

Yo I heard Russell’s paradox about sets containing themselves

#

Maybe this is a dumb question, but how could a set contain itself?

#

Ok to fully understand the paradox would I need an understanding of formal logic and stuff like that

#

Cause I have no idea what an unrestricted comprehension is

fringe needle Sep 16, 2021, 5:23 AM

#

neat lintel I am planning to take up a challenge to excel in a math field in 6 month. What d...

2h a day is far from enough to “excel” in a math field

wicked ore Sep 16, 2021, 5:24 AM

#

Well my intuition tells me that’s impossible because it would contain infinitely many nested copies in itself. But I feel like in this context there’s no such thing as infinity or nesting, and the only thing that matters is sets and properties

#

Oh that’s not so bad

#

Haha to understand, I mean

#

But yeah

#

Ah

#

So Russell’s Paradox is about showing that allowing unrestricted comprehension leads to a contradiction?

#

Ah that makes sense

#

“Comprehension” in this case refers to the rules about what P(x) can be, right?

neat lintel Sep 16, 2021, 5:27 AM

#

Since I don't know which topic in math I should choose to study, what I am planning to do is first go through
Mathematical Methods for Physics and Engineering book(I am interested in physics too) and later choose the topic that interests me for further studies.
What do you think about this method?

wicked ore Sep 16, 2021, 5:28 AM

#

Sick

#

Ok wait what do you mean when you say “restrict comprehension to subsets of already-known sets”

sick burrow Sep 16, 2021, 5:30 AM

#

yeah "sets can't contain themselves is just Foundation, right?"

#

or like an equivalent form of it

#

and Foundation is really only there for convenience since any model of ZFC without foundation has a submodel where Foundation holds

wicked ore Sep 16, 2021, 5:31 AM

#

Ohhh

sick burrow Sep 16, 2021, 5:31 AM

#

wait a second I feel like I forgot something

#

what if your model of ZFC without foundation is just ZFC?

#

*a model of ZFC

#

but then doesn't your model contain a submodel of ZFC?

#

violating Incompleteness

#

right

#

but Incompleteness would need a proper submodel

#

or rather a set model

#

nothing I just momentarily forgot how set theory worked

#

WF is well-founded sets right?

#

that's the submodel you take?

#

but it's not a set model

#

is it ever a set model?

#

Wait how do you use the Mostowski collapse again?

#

when I say set model I mean it's a set in the model of ZFC

#

take some model M of ZFC

#

take what M "thinks" is WF

#

is that ever a set in M?

#

oh duh

#

I was going to say "no because WF contains ON"

#

but I feel like that's a bit more elegant

#

idk

timid spindle Sep 16, 2021, 8:43 AM

#

🤞 ZFC

quiet geode Sep 16, 2021, 9:00 AM

#

Wanted to know if theres enough information to solve this problem

fair tinsel Sep 16, 2021, 9:00 AM

#

If you replaced the R in your name with a D and remove the Pang your username would be perfect

quiet geode Sep 16, 2021, 9:01 AM

#

#help-9 message

leaden torrent Sep 16, 2021, 9:01 AM

#

no its equivalent to ch

#

serious answer: yes theres certainly enough info

quiet geode Sep 16, 2021, 9:01 AM

#

Damn

#

I must try harder then

#

Thanks

leaden torrent Sep 16, 2021, 9:02 AM

#

first semester combinatorics

quiet geode Sep 16, 2021, 9:02 AM

#

isnt this super lengthy?

leaden torrent Sep 16, 2021, 9:03 AM

#

no

#

1 liner

#

think of the negation

#

there are 18 people not doing swimming, 14 not skating, etc.

#

compute the maximum not doing at least 1

quiet geode Sep 16, 2021, 9:05 AM

#

Well i actually went in that route

leaden torrent Sep 16, 2021, 9:05 AM

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$\abs{a \cap b \cap c \cap d} = 60 - \abs{\overline{a} \cup \overline{b} \cup \overline{c} \cup \overline{d}}$

fathom swallowBOT Sep 16, 2021, 9:05 AM

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Namington

quiet geode Sep 16, 2021, 9:08 AM

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Why m i never confident whenever it comes to negation

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It was actually the first thought that crossed my mind as soon as i saw that problem

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Yeah

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So

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What if

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Some of the people who dont swim also dont skate or tennis or bowl?

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By looking at the answer, i know i shouldnt be worried about this case

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But still i am

leaden torrent Sep 16, 2021, 9:19 AM

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we're thinking of the maximum

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that will not occur in the maximal case

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in the maximal case, we can assume everyone is perfectly arranged so that the sports they dont do dont overlap, so long as there are enough people (pigeonhole)

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the sum is less than 60 so thats valid here

quiet geode Sep 16, 2021, 9:21 AM

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I didnt get it

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Minimum number of people who play all 4 sports = Total - Maximum number of people who dont play all 4 sports?

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@leaden torrent

leaden torrent Sep 16, 2021, 9:31 AM

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yes.

quiet geode Sep 16, 2021, 9:32 AM

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Why do we have to assume that theres no overlapping?

leaden torrent Sep 16, 2021, 9:33 AM

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its a safe assumption since we're looking for a maximum

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if theres an overlap, it wont be the maximum

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since we could swap out one of the students in one of the sports to get rid of the overlap

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(caveat: we need enough students to actually do this, so if there were, say, only 30 students, this wouldnt work)

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(but in that case the answer is trivially 0)