#serious-discussion

1 messages · Page 313 of 1

fathom swallowBOT
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Heavenly Philosophy

valid hornet
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Wait a moment, let me see if I'm capturing the thought right...

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So, $\operatorname{range}(g^{**}) \subseteq A$.

fathom swallowBOT
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Heavenly Philosophy

valid hornet
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So, $\operatorname{range}(g^{**}) \subseteq \operatorname{range}(g) \subseteq A$

fathom swallowBOT
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Heavenly Philosophy

valid hornet
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And because of the bijections, $|\operatorname{range}(g^{**})| = |A|$.

fathom swallowBOT
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Heavenly Philosophy

valid hornet
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I have to work on the names so they're not as confusing, but that's an idea for me.

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Then, it's easy to prove that $|\operatorname{range}(g^{**})| \leq |\operatorname{range}(g)| \leq |A|$

fathom swallowBOT
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Heavenly Philosophy

valid hornet
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Actually, I don't need to prove that injunction then.

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I can just say that either $|\operatorname{range}(g^{})| = |\operatorname{range}(g)|$ or $|\operatorname{range}(g^{})| \neq |\operatorname{range}(g)|$, which is simply a truth of logic.

fathom swallowBOT
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Heavenly Philosophy

upbeat heart
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What

valid hornet
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It's seems like I have to prove the < relation is transitive in order for it to work, which seems equivalent to the theorem I'm trying to prove, so it might be pointless anyway...

orchid frigate
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Hi

valid hornet
fresh comet
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hello! nachoWaves

orchid frigate
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How is everyone tonight?

fresh comet
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I'm doing alright happy

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how about you?

orchid frigate
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Tired but ok

fresh comet
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aw, I hope you can get some rest soon MiniheraBow

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but it's good that you're doing alright EB_EeveeHappy

pseudo glade
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Hii

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I am new to this channel

fresh comet
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how's your day going? EB_EeveeExcited

pseudo glade
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Thank you

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Just now started..

fresh comet
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nice! any plans for the day? :o

pseudo glade
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Morning

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I have maths test

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On conjugate gradient algorithm

fresh comet
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I see holothink

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I wish you the best of luck with the exam happy

pseudo glade
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Thank you🙌

fresh comet
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I hope you got a good night's sleep giggle

pseudo glade
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No

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😑

hollow panther
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$testing \sum_{i=1}^n i^2 = \frac{n(n+1)(2n+1)}{6}$

fathom swallowBOT
orchid frigate
fresh comet
orchid frigate
fresh comet
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still working on some math problems, though I should really be doing my actual homework EB_JolteonGiggle2

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going to go to bed soon

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gotta wake up in 7ish hrs

misty owl
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Hello how’s it going?

pseudo glade
misty owl
arctic kettle
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can the sss congruence rule be proved ? i know sas rule is an axiom (silly ques)

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without using any other congruence rules

gritty heath
bright badge
gritty heath
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Whats your definition of congruence anyway

bright badge
gritty heath
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Yeah but then what do we mean by same shape and size

bright badge
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the angles and sides are the same

gritty heath
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The problem is that its vague so we dont have anything to start with

gritty heath
bright badge
gritty heath
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And cosine rule gives you the three angles are the same

gritty heath
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You need a start point to work with

gritty heath
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Now you can think why SAS is enough to show the sides and angles are all equal

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Or why SSS is enough

bright badge
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yep..got it

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thanks @gritty heath

mint canopy
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@pliant moon I see you also posted your ad here. Since I can't tell if you posted it before or after I asked you not to, I'm just going to remove it. Please don't post any more ads.

stone dome
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Hi

sonic vault
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can someone

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help me with a capacitor doubt

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ik it is not maths

valid lance
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Hi

jagged ridge
valid lance
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Wassup

jagged ridge
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probabilities

valid lance
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Me too lol

jagged ridge
valid lance
jagged ridge
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oh hsi

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how old are you?

valid lance
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Nah am not standing probability

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Am just studing

valid lance
jagged ridge
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17

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im studying for my finals of highschool

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exam is tmrw

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and i dont understand probabilities

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at all

valid lance
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Lol

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Where u frm

jagged ridge
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belgium

valid lance
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Oh nice

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That's kinda nice country

jagged ridge
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except the math exams

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💀

valid lance
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Lmao

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Well am 16

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Am younger than u

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It's your last year at highschool right

jagged ridge
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yeah

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i mean

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iml home schooled

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but i have to study

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and pass exams

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every now and then

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this is my last one

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after this

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i graduate

valid lance
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That's great ig

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What u can't understand

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Tell me the question

jagged ridge
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i dont understand

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anything

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actually

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look

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dms

valid lance
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Give me a pic of question

jagged ridge
valid lance
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Yeh

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Done

vivid echo
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Wasusp

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🪿

tropic pivot
vivid echo
tropic pivot
vivid echo
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I'm goodm

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How about Ou

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You

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🪿

tropic pivot
vivid echo
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People should talk here.

tropic pivot
vivid echo
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Idk

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Why not.

tropic pivot
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I think we should go there where the crowd is.

vivid echo
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Nipe.

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Nope.

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The opposite.

tropic pivot
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Okay. You should wait for it. Good luck from here.

vivid echo
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Cream stew

atomic seal
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@mint canopy what other roles are that are related to "active"

mint canopy
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Active, very active, emeritus.

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That's all.

quick beacon
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Helpful is also bot assigned and based on activity

mint canopy
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Oh, I didn't actually know that

atomic seal
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Helpful is like specifically in the help channels?

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Also it seems like it takes a lot of effort to get these roles

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I am very active for some time now

quick beacon
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There are caveats to helpful, and I don't know all the details because they're in a separate repo that I don't currently have access to

mint canopy
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It doesn't take a lot of effort, you just have to participate in the actual math channels.

atomic seal
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thats the only channels I participate in xD

mint canopy
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Cool

bright condor
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If you are worthy, the bot will know.

vivid echo
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What bot is this

quick beacon
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@quasi jetty

atomic seal
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ok

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I will end this here

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thanks

vivid echo
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Squee

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K

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🐀

thorny scaffold
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What is the best approach to improve your math knowledge when you're going in school, and are "way" before your math-course/peers (and always been, [not to sound like a complete jerk]). Currently our math course is really basic and covers the bare fundamentals from what it feels like. The problem with that for me is that it gets way to boring, how advanced you even make it. For example, our course does not include logarithms, polynomials, derivative, integrals or anything like that. But the math in it still expects you to use those kinds of concepts, but in the form of using a graphical solution to it, like desmos or geogebra.
And since I already know how to use those, when to use them etc I fallback to using them, even when you're "not supposed to" according to the math course.

My new maths teacher wants me to continue with the same math course and it's contents, in opposite to working my way up, exploring new math concepts and broadening my toolbox and understanding. What he says is basically that he wants me to work with the courses math, but in a more advanced way. Which is pretty tough imo, since you can only make it that hard, without it becoming unnecessarily repetitive and annoying to work with, as well as boring.

So I really want to hear your opinions, what's the best approach, or at least what will benefit me the most? Possibly coming from someone who has been in the same situation as me.

inner canopy
thorny scaffold
toxic birch
inner canopy
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how comfortable are you with the material being presented?

thorny scaffold
inner canopy
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Okay that's good

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So your familiar with some basic notions of calculus?

thorny scaffold
# toxic birch Just master what you study at school first and you can find everything yourself ...

Alr fair enough, but how would that benefit me more than by continuing into higher topics? I feel like it can easily get to boring for me that way, and essentially just make math boring overall. But at the same time if I just work my way up, I might miss something important that messes up for me in the long run. So pretty tricky situation. I do feel really comfortable with my knowledge so far, so I doubt it will be a problem.

inner canopy
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That's good

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Are you looking to get into pure Mathematics or do you wanna know more math for applied purposes

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Because that sorta leads you to two different tracks

inner canopy
# thorny scaffold Pure maths

Okay good
My main idea would be to look at what first year courses a university nearby offers and what material they use and start learning from those

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These are usually something like linear algebra, analysis or abstract algebra

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And there are introductory texts to all three out there

grave vale
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some 5 year old made this crazy right

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lowkey might sub ngl

cinder ember
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being exposed to university courses early on can also help you adapt more quickly to the extreme jump that is high school -> college, once you do start it

random void
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Ded chat

errant zenith
random void
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Gotta make a move to a town that's right for me!

pearl spoke
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epic embed fail

warm umbra
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Welcome to the server @thick sorrel @wheat mauve

wheat mauve
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thanks

zealous trellis
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o7 charlie

delicate tendon
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but tbf, i think the people who do get it are chronically on this discord; atleast a convo every 2-3 hours

warm umbra
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Welcome to the server @shut axle

true zinc
zealous garden
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VA took work

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Especially as someone who only uses discussy

true zinc
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ehhh

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wasn't that hard

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according to Ryan

zealous garden
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Aren't you in topic channels too

true zinc
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then again we nolife discussy

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so

true zinc
zealous garden
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I wasn't in them at all

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No topic or help channels

true zinc
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we're mainly in discussion, adv lounge, math disc, and books

zealous garden
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Only discussy grinding

shut axle
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i got a 13% on my last test

round pecan
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chil

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sometimes in life

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you will have to fail

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but through failures you learn

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welcome @shut axle

tropic pivot
neat lintel
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Hi everyone! 👋
I’m Arya, I am 17 years old and a self-taught math enthusiast. I explore combinatorics, geometry, algebra, and analysis, and I’ve been writing some independent research papers.

I also started a blog where I share my work and puzzles:
🔗https://aryasalgorithm.blogspot.com/?m=1

You can find all my research papers there

Excited to learn and discuss math with you all!

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I have worked in isolation, so Idk how much my research work contributes, but I think it would be great if I had some fresh eyes upon it

neat lintel
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Just tryna reach out to ppl who might be interested in my work

vivid echo
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:3

errant totem
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I need someone who can teach me trignometry in zoom

vivid echo
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Why zoom

neat lintel
errant totem
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ok

vernal shard
vernal shard
neat lintel
grim cargo
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heyaaaa!!

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wassupp

vernal shard
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nobody here

gilded ferry
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How do I make a hell ticket

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!help

quasi jettyBOT
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To ask for mathematics help on this server, please open your own help channel or help thread. See #❓how-to-get-help for instructions.

severe robin
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Its peaceful here

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I love this empty space

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I can breathe here

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Phewwwww

ocean harbor
severe robin
solid yarrow
polar temple
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when bro says he'll touch me so i tell a trusted adult

ocean harbor
polar temple
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its not that bad 😭

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it's peak humour

ocean harbor
polar temple
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oh, that is wonderfully taken out of context opencry

ocean harbor
true zinc
true zinc
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we didn't know, sorry

solar hawk
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Soy una rana

neat lintel
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yes sir

wanton roost
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How do yall fell about Matrixes

vocal light
wanton roost
neat lintel
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i think its a plausible concept

wanton roost
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they’re pretty cool

neat lintel
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tho not in the advanced ai way

vocal light
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GCSE Further maths matrices were alright but at A Lvel FM theyre a nightmare

vocal light
true zinc
# vocal light i despise them

Matrices are just representations of linear transformations between two vector spaces V and W with bases \beta and \gamma respectively

true zinc
fathom swallowBOT
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James + Ryan (TCC)

true zinc
vocal light
# true zinc

ill go work on it since I have to for exams as well as set notation since it looks so weird, but thanks

true zinc
fathom swallowBOT
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James + Ryan (TCC)

vocal light
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i only remember the identity matrix 😭

true zinc
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now this is a linear transformation (T \colon \mathbb{R}^{2} \to \mathbb{R}^{2})

fathom swallowBOT
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James + Ryan (TCC)

zealous garden
zealous garden
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A rotation is an element of the kernel of det on O(V,B), the group of isometries of a metric vectorspace

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Det viewed as a morphism from the orthogonal group to the multiplicative group (+1,-1) in K

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Over a quadratically closed field, and for nondegenerate spaces, it indeed reduces to a single parameter n

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Over a euclidean closed field it reduces to two, p,q (this is sylvesters law of inertia)

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For example just over R we have SO_1,1(R)≠SO_2(R)

wanton roost
queen scarab
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1+1 = 2

wanton roost
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Wdym they’re overused?

zealous garden
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Unless you are wishing to exclude spacetimes and other mixed signature rotations.

queen scarab
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Hallo

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gyatt

zealous garden
# wanton roost Wdym they’re overused?

I mean people act as if linear maps and matrices, or vectors and matrices, are the same things when they're not. And overuse the connection when sometimes a more satisfying option might be available

wanton roost
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I see

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Btw if I may ask are you in uni?

queen scarab
zealous garden
stuck herald
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who pinged me

queen scarab
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Even the 8-year-old I saw on YouTube

zealous garden
wanton roost
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He got a 0 in math last school year

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But he still passed

queen scarab
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I dropped out of high school

queen scarab
queen scarab
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🥳

zealous garden
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Not only does not everyone know LA 1, but that's a nonsequitur anyways

true zinc
zealous garden
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I want to learn about how the classification of the orthogonal groups differs from that of the metric vectorspaces they attach to

steel blade
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You should learn PDEs

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Basics atleast

vivid halo
zealous garden
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For example, (R^n, g)≠(R^n,-g) with g the standard dot product, but their orthogonal groups are the same

vivid halo
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but also good to work through the details

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actually it's a pretty subtle point whether you're actually meant to think of these orthogonal groups as the same or not

golden flint
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hello I am y13 and I want to apply for cam maths does anyone have any advice on how to prepare for the step

zealous garden
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Also Q^2 with (a,b)->a^2+b^2 and Q^2 with twice that form should have the same orthogonal groups

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No?

vivid halo
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you can write down an isomorphism between them but there are various situations where you actually want to think of them as distinct otherwise it completely fucks up certain results

zealous garden
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Really? Good to know

zealous garden
vivid halo
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this comes up a lot when trying to correctly formulate things like the local or global Langlands correspondence correctly

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in general if you have a linear algebraic group G over a local of global field F then you're really meant to view the representation theory of G as packaged along with the representation theory of its inner forms

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the set of inner forms of G has a distinguished basepoint, namely the quasisplit inner form G* of G

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for example if you look at the unitary groups U(p,q) of signature (p,q) over R then the quasisplit inner form will be U(n,n) for p+q=2n even and U(n,n+1)=U(n+1,n) otherwise

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and when you study the representation theory of unitary groups, you actually get quite bad structural results if you index this set of inner forms up to isomorphism

zealous garden
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Inner forms=Isometry groups?

vivid halo
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no so like inner forms arise when you use Galois cohomology to classify linear algebraic groups over non algebraically closed fields

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the usual trick by Galois descent is like, if you want to classify objects X over a field F then it suffices to classify objects \bar{X} over an algebraic closure \bar{F}, and then classify the possible forms over F

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in other words you want to classify objects X over F which become isomorphic to \bar{X} over \bar{F} after base change

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such objects X over F are classified by classes in Galois cohomology H^1(Gal(\bar{F}/F),Aut(\bar{X}))

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you get inner forms by replacing Aut with Inn, and outer forms by replacing Aut with Out

vivid halo
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inner/outer automorphisms

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0->Inn->Aut->Out->0

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when you're talking about groups the inner automorphisms are just those given by the obvious conjugation action

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for example the unitary groups U(p,q) are outer forms of GL_n(C) for p+q=n: they are groups over R which become isomorphic to GL_n(C) over C, but are certainly distinct from the groups GL_n(R) over R. This is because they differ by an outer twist

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in the classification the outer twists happen by looking at possible symmetries of the Dynkin diagram, in this case you're looking at an order 2 reflection symmetry in the type A Dynkin diagram

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subtleties aside it is nice that you can reduce the classification over arbitrary fields to the classification over algebraically closed fields along with Galois cohomological machinery

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when you classify groups over R this is why you see these two colored Satake/Vogan diagrams that look like Dynkin diagrams: the classification over R reduces to the classification over C (where things are classified by Dynkin diagrams) plus some additional decorations

zealous garden
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Interesting perspective

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Too far for me, I know neither galois theory nor (co)homology

vivid halo
#

maybe some good motation to learn some group cohomology

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you only need H^1 and occasionally H^2 for this story and these can be described very explicitly by hand

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e.g. if M is a G-module (an Abelian group with G-action, or a Z[G]-module) then H^1(G,M) is the set of crossed homomorphisms (maps of sets f:G->M satisfying f(gg')=f(g)+gf(g') for every g,g' in G) modulo the set of principal crossed homomorphisms (crossed homomorphisms f:G->M of the form f(g)=gm-m for some m in M)

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H^0(G,M)=M^G is G-invariant elements of M

hollow ginkgo
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H^2(G,M) is equivalence classes of group extensions M.G

wanton roost
#

Math is lowkey goated

old oak
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lowkey?

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Also I'm deeply disappointed in myself that I took issue with that part, rather than with the absurd word "goated"

junior veldt
#

Old moment

neat lintel
slender plume
#

This is for jay

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nvm i cant send images 😭

pure hollow
reef carbon
#

@vale pumice what did you want to ask me

vale pumice
#

its from compulsory mathematics

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so

reef carbon
#

... you wanted to catch me to help you with a math problem?

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open your own help channel.

vale pumice
#

how

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i just wanted to ask a question

reef carbon
#

#help-14 is free right now -- type something there

vocal light
wise bloom
#

Hello

bronze pelican
#

I know that the real forms of sl_n(C) are sl_n(R), su(p,q) where p+q=n, and also sl_n/2(H) if n is even.
How does this set of real forms partition into classes of inner forms?

vivid halo
#

Think about how these partition into outer forms first

bronze pelican
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Seperately, I know reductive linear algebraic groups over algebraically closed fields are classified by root datum, but I don't know how to classify their real forms given a root datum

vivid halo
bronze pelican
#

Ah yes, I remember reading about this in Springer

vivid halo
#

but yeah for example all the su(p,q)'s are inner forms of each other

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the real and quaternionic forms are distinct from these

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but yeah what I meant by thinking about the representation theory of all inner forms at once and this subtle point about when to consider two inner forms as equivalent or not, there is a really nice example illustrating this involving U(p,q) actually

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for n>0 fixed the real groups U(p,q) with p+q=n constitute an inner class

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if you have a discrete Langlands parameter \phi:W_R->GL_n(C) there will be 2^n many representations of these U(p,q)'s with this Langlands parameter, forming a packet

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for a given U(p,q) there are p+q choose q such representations

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these sets as p+q=n varies form this set of |S_\phi|=2^n many representations

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the subtle point is that U(p,q) and U(q,p) are the same inner form of the quasisplit inner form in this inner class (and are isomorphic as real reductive groups) but they need to be considered as separate for this count to work out

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you only get nice multiplicity formulas and packet structure when you consider all of these U(p,q)'s at once, not when you consider them individually

olive pasture
#

@acoustic kestrel Hey any news on the mext exam? 🙃🙃

nimble sparrow
burnt ledge
#

shes reading it to the xat

wanton roost
#

Thoughts on physics

junior veldt
#

It’s cool

tribal slate
#

,w sonic like curve

zealous garden
#

Gotta go fast

heavy condor
#

(x-1)/6=11
(x-1)=66
x=67
SIX SEVEN

zinc knot
#

💀

mortal cargo
warm umbra
#

Welcome to the server @heavy condor

wanton roost
#

@polar temple I’m switching to physics, decided

wanton roost
dusk kestrel
#

i‘m sure you‘ll find more happiness and … less job opportunities here

wanton roost
#

Thank u

#

I’m hoping I can get into a double major of Math and CS

mortal cargo
wanton roost
flat dome
#

boom 💥

placid hawk
polar temple
ocean harbor
#

its fumo from touhou

polar temple
#

physics is a cool subject too

wanton roost
#

I mean I picked physics instead of biology this school year

#

I still wanna do the double major

polar temple
#

fair enough

#

good decision (biased pov from another maths+cs guy)

ocean harbor
#

but its the cat

#

that will be me too if i had a pet kekw

snow bramble
ocean harbor
dusk kestrel
#

not sure if its worth it….

ocean harbor
#

worth it if u cant find a job

crystal basalt
#

Is it nano tech worth it I find it interesting

ocean harbor
fresh comet
#

hello discussion 2 nachoWaves

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how's everybody doing?

ocean harbor
tawny knoll
ocean harbor
empty mirage
#

@fresh comet Higher!lisayay

fresh comet
#

higher! lisayay

vernal orchid
fallen viper
#

@skid

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@river totem

sullen dagger
#

has anyone used chatgpt to learn math?

vast wraith
#

i love scrapping things

ocean harbor
glad nova
#

evening folks

balmy pawn
sullen dagger
balmy pawn
# sullen dagger Why not

chatgpt seemed too agreeable to be a good teacher. also, it made mistakes & gave faulty explanations that someone with a real brain would not

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i called one out & this damn robot that exists in the wires started talking to me about making a typo… 😭

signal mason
craggy wraith
#

@thorn wren

#

HAHAHA YOU THOGUHT U GOT UR FIRST MOD PING GAGAGAHGGAGSGAGGGSGAFS

thorn wren
#

I hath been summoned

twilit parrot
craggy wraith
#

Or maybe u didnt idk

twilit parrot
#

It’s unreliable

thorn wren
craggy wraith
#

Lmaoo

haughty lion
#

Congrats on blue name @thorn wren

thorn wren
vagrant maple
#

any computer science student

errant talon
north topaz
winter ermine
north topaz
winter ermine
#

Ah ok

north topaz
#

it's a joke on how both roles are blue

#

different shades of blue but yes

winter ermine
#

Ahh ok I get it 🤣

meager flare
#

any electrical engineering student?

ocean harbor
ocean harbor
winter ermine
#

@undone zinc welcome to the server!

#

(i finally figured it out)

grand helm
#

why are mathematicians so unhinged

tulip geyser
#

yooo

#

hello

true zinc
grand helm
unkempt moat
true zinc
unkempt moat
#

Tru

true zinc
#

This is/was far less of an issue when people were still using BBS, smaller forums, IRC, etc...though this was partially due to lack of ability to utilize the internet, however there was also the benefit that most of the people using the platforms actually already knew what they were doing and there was at-least a mild amount of basic computing knowledge required to access these systems so intellectual discussion is far easier

ocean harbor
supple vale
#

Middle left

#

Meanwhile any SSC aspirant here?

#

I need people to rant about its subjects

ocean harbor
#

no

#

bread

fresh comet
#

bread catto eeveekawaii

rocky shuttle
vast wraith
vast wraith
gloomy hound
#

GUys did anyone notice how easy the math section was this year

#

for the sat

sour rapids
#

why again

waxen wave
#

@outer saddle hyy?

eager ledge
grand helm
warm umbra
#

Welcome to the server @tulip geyser

undone lichen
#

whats ur guy's favorite derivative notation

agile fiber
#

i think euler notation is sadly underused

sharp basin
#

[Lagrange's notation] is named after Joseph Louis Lagrange, although it was in fact invented by Euler and popularized by the former.
...
[D-notation] is sometimes called Euler's notation although it was introduced by Louis François Antoine Arbogast, and it seems that Leonhard Euler did not use it.
https://en.wikipedia.org/wiki/Notation_for_differentiation
Waow, strange naming

heavy condor
#

what if we added a vc to math

limber thunder
#

assuming you meant that

heavy condor
#

ya

gritty heath
# vast wraith

Everyone asks where's the cat but no one ever asks how's the cat

warm finch
#

be wary of physics discord

fluid knot
warm finch
fluid knot
#

But there are only 2 or 3 decent networks

supple vale
warm umbra
#

Welcome to the server @serene burrow

serene burrow
ocean harbor
ocean harbor
solar hawk
latent edge
#

holy shit @thorn wren is a mod

#

scary

thorn wren
latent edge
#

mute on ping when

#

congrats ig?

#

i know some dont like being a mod

plain island
inner canopy
latent edge
#

real

ocean harbor
#

,av despairful_deltoid

fathom swallowBOT
#
despairful_deltoid's Avatar

Click here to view the image.

fierce abyss
#

How is recurrence of tense defined in English? For example , base case: A_0=“have done”
Put one hypothetical past outside A_0 (p):
(If I went to school, I) A_1=“would have had done” …
Put one hypothetical past outside A_1 (p-p):
A_2=“would have had had done”
Put one hypothetical future outside A_2 (p-p-f):
A_3=“would be having had had done”
A_4 (p-p-f-f)‎ = “would be being having had had done”
A_5 (p-p-f-f-p)‎ = “would have been being having had had done”
Is my example correct?

#

How is tense shifted to hypothetical future? This part I get confused mostly

warm finch
# fierce abyss How is recurrence of tense defined in English? For example , base case: A_0=“hav...

well for A_1 it’s “i would have done” you can’t really say the rest of them and be grammatically correct.
it would be
A_0 “have done”
A_1 “would have done”
A_2 still “would have done” unless there’s a conditional clause like “ if i had had more time”
A_3 “would be doing or would have done”
A_4 “would have been doing or would have been done”

also to try and answer your question. english doesn’t have a special future tense. there’s modular auxiliaries that you have to use instead.

without getting too much in the technical details

now: i have done
past: i did
notice how this is very similar as i have done technically speaking
future: i will do
future hypothetical: i would do

#

the main difference is the words themselves called modal auxiliaries like “will” “would”

#

also

#

and lastly my daily post to be wary of the physics discord because of the pedophile (confirmed if mods need to check to not delete the message dm) that banned me

fierce abyss
#

Say right now it’s 4 pm, so a correct sentence is (If A told B at 1 pm that (if B told to C at 2 pm that (if C told D at 7 pm that (if D told E at 8 pm that (if E told F at 3pm that he went out))))), I wouldn’t have called him? (p) I wouldn’t be having had called him? (p-f-p)? I wouldn’t have been being having had called him (p-p-f-f-p)?

warm finch
fierce abyss
#

In practice no more than 2 layers then right?

warm finch
fierce abyss
#

Oh

warm finch
#

like no matter how long the chain is it will land on would do, would have done, will do

#

etc

#

that’s why it’s not really like math in that way

fierce abyss
#

Oh so I just look at the final step, the event happened in the past, or will happen in the future compared to reality, no matter what the netted hypothesis is like?

warm finch
#

idk if i’m explaining well this is really hard to understand and explain, it’s more of an intuitive thing you build up with practice in a way imo

warm finch
#

would have or will be doing or would be doing etc

fierce abyss
warm finch
fierce abyss
#

I mean, eventually if A told B that if B told C that… I wouldn’t have called him. The reality is at 3 pm, I called him, now is 4pm, if I ignore all the construction in the middle, the simplest expression is “I wouldn’t have called him”?

warm finch
#

feel free to reply or tag me if you have more questions that come up about this

#

and remember be wary of physics discord

burnt ledge
#

if A had told me that had B told me that I had eaten, I wouldn't have eaten, I would have eaten

fresh comet
slate wind
#

If you do very well in your 12-math class, you should be well prepared in theory.

covert drift
#

3/25

undone lichen
#

and for my last trick, i will learn all about derivatives in 8 hours

viral leaf
#

This is unrelated to math, how would you guys make posters im kinda doing one rn

sharp mulch
#

What sort of poster

#

Academic?

limber thunder
#

are you enrolling in a math major? if so it might help to learn about logic, sets and proofs beforehand since the kind of math one studies is really about that, about showing that certain statements are true by working only with the ideas in a way. I think Hammack's book is a good introduction and I keep recommending it: https://richardhammack.github.io/BookOfProof/

if it's other STEM major it might still be worth it to review calculus and algebra but I wouldn't overdo it

viral leaf
#

whoops sorry for late reply

sharp mulch
#

?

#

Yeah what

viral leaf
#

uh its a religion one

#

for responsible citizenship

sharp mulch
#

Anyways

#

I primarily use Adobe Illustrator to make posters

#

If you don't have access to Adobe products you can use something like powerpoint or google slides

viral leaf
#

I mean like the layout because im supposed to make it on paper

#

because im kinda stuck on that

limber thunder
#

huh I haven't had to do a thing like that since elementary catthink

viral leaf
#

yeah im in grade 9 lol im kinda outmatched by everyone here

limber thunder
#

I guess just grab a pencil and trace some space for a title and two columns or whichever amount you'd like

viral leaf
#

:/

limber thunder
#

depends on how large the poster is supposed to be

viral leaf
#

A4

#

k thanks

limber thunder
#

where you're kinda stuck on how to do a common (?) thing

viral leaf
#

oh i see

#

ive never looked into it

spark vessel
#

So

hard oasis
#

I'm here, you lovely baguette

spark vessel
#

🥖

#

What are you working on exactly?

hard oasis
#

In TeX?

spark vessel
#

In maths

hard oasis
#

Oh!

#

Well, now I'm a hs teacher soooo opencry

spark vessel
#

Btw I have 0 knowledge of advanced maths

hard oasis
#

But I used to do geometric topology in dimension four

hard oasis
#

What's your level of studies?

spark vessel
#

Congrats on being a teacher catking

spark vessel
hard oasis
#

I shee

#

Not bad then, you will definitely help some folks out there!

#

Like the linalg questions from L1/L2 are quite common

spark vessel
#

I have to reread my notes before I start uni again

hard oasis
#

It hasn't started yet? catFrighten

spark vessel
hard oasis
#

Ah catGiggle

spark vessel
#

Starts on the 29th for me

hard oasis
#

Well, there's always analysis that pops up a lot as well catGiggle

spark vessel
#

What level are you teaching in hs?

hard oasis
#

Seconde and Tale this year

#

I have a Tale spé catGiggle

spark vessel
hard oasis
#

But they're not very good opencry

spark vessel
#

No maths expertes

hard oasis
#

3 hours into a course of "révisions et complément sur la dérivée", I have one asking me what a derivative is opencry

hard oasis
spark vessel
#

Did bro skip 1ere or what

hard oasis
#

Yeah opencry

#

I asked his teacher from last year and he was there but the grades were not opencry

spark vessel
#

My grades in maths expertes were like so bad

misty oracle
hard oasis
#

Because of what chapter?

spark vessel
#

Arithmétique

hard oasis
#

Ah of course

spark vessel
#

Only this shit

#

Complex and matrices were fun

#

Not too bad

hard oasis
#

Complex numbers is typically more enjoyed

#

Yeah matrices too

spark vessel
#

But the freaking modulo killed me

hard oasis
#

Arithmetic is hard because there are proofs

zealous garden
#

I hate matrices

hard oasis
#

Students dislike those catGiggle

spark vessel
#

It was impossible for me to get the logic

zealous garden
#

Endomorphism algebras are great though

spark vessel
#

It was jus too absurd for me

misty oracle
zealous garden
spark vessel
#

The thing is I had one of those teachers who expect you to understand right away

zealous garden
#

And bases

misty oracle
hard oasis
zealous garden
zealous garden
#

That's why I hate matrices

spark vessel
#

On day in class we were doing a problem (arithmetic still) and after a minute she goes "so what can we do apart from staring at the énoncé"

zealous garden
#

Matrices reduce it all to the boring algebra and a bunch of computations

spark vessel
#

💀

hard oasis
#

Oof

zealous garden
#

Keep your perspective on linear maps for cool shit

spark vessel
#

Maths spé was fun tho

hard oasis
spark vessel
#

It's a shame your not doing 1ere, I would love to know what it's gonna be like preparing the new exam

hard oasis
#

I'm curious because I will have students hating some of them opencry

spark vessel
#

I enjoyed all of them

hard oasis
spark vessel
#

Favourite integrals

hard oasis
#

I shee catGiggle

spark vessel
#

Since seconde I would see the symbol and I really wanted to undertand them

spark vessel
#

Least favourite

#

I'd say

#

Suites numériques

hard oasis
#

Not convexity?

spark vessel
#

Jusy because récurrence is too much manual labour lmao

hard oasis
#

Or, worst: statistics

spark vessel
hard oasis
spark vessel
#

The second derivative was always so looong to calculate

hard oasis
#

But like if it's just showing that u(n)=<something>, this is a trivial induction indeed

#

Just compute the damn thing and you're done

spark vessel
#

But si don't think I'll need récurrence

spark vessel
#

Especially as I had all the program

hard oasis
#

I'm legit scared to teach stats, because I hate this stuff and it's awful as heck

#

Also I suck at stats opencry

spark vessel
#

Bienaymé Tchebithev catangery

#

Or whatever the spelling is

hard oasis
#

That's probabilities so it's fine catGiggle

#

Bienaymé--Chebychev?

spark vessel
#

Yes

#

God I butchered their names

hard oasis
#

Well, BT is "Markov à l'ordre 2" opencry

spark vessel
#

Hmmm

hard oasis
#

Or "Markov pour X^2" opencry

spark vessel
#

-# what's this Markov thing

hard oasis
#

,tex\makebf E$$\PP(|X|\geq\alpha)\leq\frac{\EE[X]}{\alpha}$$

spark vessel
#

Hmmm

fathom swallowBOT
#

TeXplotlib

spark vessel
#

PTSD incoming

hard oasis
#

\makebf ESo if you use this for the variable $(X-\EE[X])^2$ you get BT

fathom swallowBOT
#

TeXplotlib

spark vessel
#

Right

#

Anyway I won't be using stats soooo

hard oasis
spark vessel
#

Wait actually I will

#

Fuck

grizzled goblet
#

Greetings champs ,am victor,new to the server,am a teen preparing for some couple promotional exams,I will be needing a good friend who would help me by teaching and sharing experiences in science subjects please

hard oasis
#

What Licence are you doing?

spark vessel
#

Astrophysics

hard oasis
#

Oooooh holy heck

#

That's amazing!!

#

I wish I did more of that!

spark vessel
hard oasis
#

I suppose my diff geo background would help me now too catGiggle

#

Do you have orbital mechanics classes?

spark vessel
#

I had classical mechanics last year

#

I don't want to talk about it

hard oasis
spark vessel
#

I swear quantum mechanics made more sense it's crazy

hard oasis
#

You should play some Kerbal Space Program

fresh comet
spark vessel
#

The day I will do lagrangian mechanics I can assure you Newton is gonna be poubelle

#

Some topics in classical mechanics were nice

#

But circular motion was so mind fucking

hard oasis
#

,,G\frac{m_Am_B}{r^3}\overrightarrow{AB}

fathom swallowBOT
#

TeXplotlib

spark vessel
#

But that's nothing compared to oscillators

hard oasis
#

That's like the best thing ever

spark vessel
#

It's r^2

hard oasis
#

It's r^3 if you don't use a unit-length vector catGiggle

spark vessel
#

True

#

Imagine seing oscillators before second order differential equations

hard oasis
#

Wait, really?

spark vessel
#

Yes

hard oasis
#

Wtf

#

That's so bad

spark vessel
#

And Schrödinger equation

#

Needles to say in term 2 everything made so much more sense opencry

obtuse grail
#

Hi

spark vessel
#

Hey

hard oasis
obtuse grail
spark vessel
#

But yeah the order was fucked up

spark vessel
obtuse grail
hard oasis
#

You new here? meowdy

obtuse grail
hard oasis
#

Welcome then!

obtuse grail
spark vessel
#

Wait so I believe you have beautifully written lessons for your class Matty meowdy

hard oasis
#

Uh

#

Beautifully-written idk 'bout that opencry

spark vessel
hard oasis
#

But I can show you some, sure

spark vessel
#

Add some pdfliterals

#

At least you use LaTeX

hard oasis
#

Holy hell of course I do, I wanna keep my sanity!

spark vessel
#

So you're already superior to most of the other teachers using Word

obtuse grail
#

So where are you from

hard oasis
spark vessel
hard oasis
#

An example of how the notes I type look like (yes I took one that had a nice picture!)

spark vessel
#

Wbtu

obtuse grail
spark vessel
#

I'm french

obtuse grail
obtuse grail
hard oasis
#

Also, I don't know if you've ever seen the proof of the fact that $\vec u\cdot\vec v=|\vec u|\cdot|\vec v|\cos\theta$?

fathom swallowBOT
#

TeXplotlib

hard oasis
obtuse grail
upper lotus
#

My notes don't look half as good haha

spark vessel
#

Tbh I don't remember but I have a vague memory

upper lotus
spark vessel
upper lotus
#

I read it in a statistics book the first time

upper lotus
hard oasis
#

Really? catGiggle

spark vessel
#

I don't think I've seen it with the trigonometric circle

upper lotus
hard oasis
#

Yeah I'd be surprised you've seen it in this direction!

#

Usually it's proven the other way around, and actually almost never proved catGiggle

#

I made this proof myself opencry

upper lotus
#

I feel like that should be the first thing shown

hard oasis
#

It should be left till the end of the chapter though!

#

Cuz it's a bit technical tbh

#

Especially for high-schoolers

upper lotus
upper lotus
#

The proof wasnt presented in my calc 3 class
I asked the professor after and he gave me some intuition but I learnt the generalized proof in the book required by another class at the same time

spark vessel
upper lotus
#

It was a long time ago

spark vessel
#

It's nice that you have proofs

hard oasis
#

The proof in the general context of linalg goes as follows: define the cosine between the angles as the ratio between their dot product and their norms opencry

upper lotus
#

Before I touched set theory 😂

hard oasis
#

This comes from Cauchy--Schwarz

#

TeXified Pascal triangle:

spark vessel
#

Are you still working on topology besides?

zealous garden
spark vessel
#

Amazing

upper lotus
spark vessel
#

Made with a macro?

zealous garden
hard oasis
upper lotus
upper lotus
#

Now prove it

hard oasis
#

Oh no I remember

#

I did a Python script that generated the TeX

upper lotus
spark vessel
zealous garden
#

Kek

hard oasis
upper lotus
spark vessel
upper lotus
#

I mean that seems like a lot of manual labor for something that 4 rows is enough to get the gist if you really did it manually but

#

With a python script it makes sense

hard oasis
#

Ikr, now I'd do it in plainTeX indeed

upper lotus
#

Can't you execute python in tex with tikz or something

#

Idk

spark vessel
#

There's pythontex

#

But Lua >

hard oasis
#

I mean, this is the code for the whole thing:

\begin{center}
    \begin{tikzpicture}
        % nCr(0,k)
        \hex{0}{8}{$\DS\binom{0}{0}=1$}
        % nCr(1,k)
        \hex{0}{7}{$\DS\binom{1}{0}=1$}
        \hex{1}{7}{$\DS\binom{1}{1}=1$}
        % nCr(2,k)
        \hex{0}{6}{$\DS\binom{2}{0}=1$}
        \hex{1}{6}{$\DS\binom{2}{1}=2$}
        \hex{2}{6}{$\DS\binom{2}{2}=1$}
        % nCr(3,k)
        \hex{0}{5}{$\DS\binom{3}{0}=1$}
        \hex{1}{5}{$\DS\binom{3}{1}=3$}
        \hex{2}{5}{$\DS\binom{3}{2}=3$}
        \hex{3}{5}{$\DS\binom{3}{3}=1$}
        % nCr(4,k)
        \hex{0}{4}{$\DS\binom{4}{0}=1$}
        \hex{1}{4}{$\DS\binom{4}{1}=4$}
        \hex{2}{4}{$\DS\binom{4}{2}=6$}
        \hex{3}{4}{$\DS\binom{4}{3}=4$}
        \hex{4}{4}{$\DS\binom{4}{4}=1$}
        % nCr(5,k)
        \hex{0}{3}{$\DS\binom{5}{0}=1$}
        \hex{1}{3}{$\DS\binom{5}{1}=5$}
        \hex{2}{3}{$\DS\binom{5}{2}=10$}
        \hex{3}{3}{$\DS\binom{5}{3}=10$}
        \hex{4}{3}{$\DS\binom{5}{4}=5$}
        \hex{5}{3}{$\DS\binom{5}{5}=1$}
        % nCr(6,k)
        \hex{0}{2}{$\DS\binom{6}{0}=1$}
        \hex{1}{2}{$\DS\binom{6}{1}=6$}
        \hex{2}{2}{$\DS\binom{6}{2}=15$}
        \hex{3}{2}{$\DS\binom{6}{3}=20$}
        \hex{4}{2}{$\DS\binom{6}{4}=15$}
        \hex{5}{2}{$\DS\binom{6}{5}=6$}
        \hex{6}{2}{$\DS\binom{6}{6}=1$}
        % nCr(7,k)
        \hex{0}{1}{$\DS\binom{7}{0}=1$}
        \hex{1}{1}{$\DS\binom{7}{1}=7$}
        \hex{2}{1}{$\DS\binom{7}{2}=21$}
        \hex{3}{1}{$\DS\binom{7}{3}=35$}
        \hex{4}{1}{$\DS\binom{7}{4}=35$}
        \hex{5}{1}{$\DS\binom{7}{5}=21$}
        \hex{6}{1}{$\DS\binom{7}{6}=7$}
        \hex{7}{1}{$\DS\binom{7}{7}=1$}
    \end{tikzpicture}
\end{center}```
upper lotus
hard oasis
#

It's not too bad

upper lotus
#

Typst is cursed

#

oo

spark vessel
upper lotus
#

For infty

upper lotus
#

Typst is nice for things you don't usually care about in markdown languages

spark vessel
#

I don't think you've got any idea of how bad I was at LaTeX at the very beginning

upper lotus
#

Like loops and stuff

hard oasis
#

Heck, can typst do that? opencry

upper lotus
hard oasis
#

,,\fact{123456789}

upper lotus
unborn meteor
#

i think

fathom swallowBOT
#

TeXplotlib

spark vessel
upper lotus
hard oasis
unborn meteor
#

yeah i know

spark vessel
#

A good old notebook with a pen >>

upper lotus
#

But I like condensed information to be in my notes

unborn meteor
#

i mean that typst is turing-complete so it can do any computable thing that its I/O supports

upper lotus
#

Like definitions

#

It's super useful to access them anywhere and then internalize it at some point

#

I reread the set theory notes I have walking around campus

#

I wouldn't bother if it was on paper

spark vessel
#

Oh hello eta carinae sotrue

upper lotus
#

Topology seems cool

hard oasis
#

Topology is cool catlove

#

And scary too

spark vessel
hard oasis
#

But hey, you can make drawings opencry

upper lotus
#

I could do a reading program at my uni for topology but I haven't taken a math analysis or abstract algebra class yet so I think it'll be a waste of my time 😭

hard oasis
#

Ankaa, did I tell you I had an average of a bit above 1 picture per page in my ~200 pages thesis? opencry

spark vessel
#

You're studyin maths?

upper lotus
hard oasis
#

No way on Earth I was doing those figures in TikZ opencry

upper lotus
spark vessel
#

Yeah

upper lotus
#

I'm a math major
And some other bullshit majors but math is the funnest one

#

Lmao

spark vessel
#

Damn you wrote a thesis in topology

#

Big brain

#

Matty the king of maths

hard oasis
#

No opencry

#

Mi smol brain

upper lotus
#

The zero dimension topology where all open sets are closed sets

upper lotus
#

Clopen

hard oasis
spark vessel
#

\mathop\mathclose sotrue

upper lotus
#

Is that the one with the paradox or something
Idk any topology

#

No

#

Lmao I was thinking of something else

#

I heard someone talking about banach tarski earlier today

hard oasis
upper lotus
#

Clopen sets

spark vessel
#

Btw do your students know you're on Discord catgiggle

hard oasis
#

Probably not, because you know how the French high-schoolers suck at English catGiggle

spark vessel
limber thunder
upper lotus
spark vessel
hard oasis
#

Yeah I do teach in hs, and I enjoy it... sometimes opencry

spark vessel
#

Are you teaching in an endroit paumé?

hard oasis
#

I wish sadcat

#

I'm from the Gers

#

So I'm waaaaaay outside my comfort zone here near Versailles sadcat

spark vessel
#

Where is Gers?

hard oasis
spark vessel
#

You got placed in Versailles sully

hard oasis
#

West-NW of Toulouse

spark vessel
#

I know this city sotrue

hard oasis
#

You've been there?

#

Best city in the whole country

spark vessel
#

-# my geography isn't too bad see

hard oasis
#

Paris = caca

spark vessel
spark vessel
#

Fyi

#

I'm from Paris

hard oasis
spark vessel
#

But I get it

hard oasis
#

I really disliked this city, sorry sadCatThumbsUp

spark vessel
#

The south is much better

hard oasis
#

Same with Bordeaux

spark vessel
#

What?

#

Bordeaux is nice

hard oasis
#

It's better than Paris, yeah catGiggle

spark vessel
hard oasis
spark vessel
#

What part of Paris have you seen to be so... negative KEK

#

You must've had a bad experience

hard oasis
#

Oh I've been there a couple times, I'm less than an hour away in RER

#

I really enjoyed the Panthéon neighborhood

#

The rest, not as much

spark vessel
hard oasis
#

But to be frank, I think the scale plays a big role in me not liking it

spark vessel
#

When I'll get the chance I'll go to toulouse

hard oasis
#

If you ever do, do tell me and I'll recommend you some places!

spark vessel
#

Sure thing!

hard oasis
#

I spent all my studies there catGiggle

spark vessel
hard oasis
#

Wtf, I spent 10 freaking years there as a student kannaAA

spark vessel
#

What do you call

#

The pastry

hard oasis
spark vessel
#

With chocolate inside

hard oasis
#

YOU KNOW HOW I CALL IT catGiggle

spark vessel
#

And it's not the right answer!!

hard oasis
#

Fun fact: there's a bakery somewhere that sells Chocolatine for like 10cts less than Pain au chocolat

spark vessel
#

You were muté à Versailles so now you adapt!

hard oasis
#

(in Toulouse)

spark vessel
#

Wait

#

10cts?

#

Is inflation not a thing???

hard oasis
#

Well I'm speaking of this about 12 years ago opencry

spark vessel
#

Damn

hard oasis
#

Also, it's not 10cts for the thing

#

It's one being 10cts more than the other