#serious-discussion
1 messages · Page 313 of 1
Wait a moment, let me see if I'm capturing the thought right...
So, $\operatorname{range}(g^{**}) \subseteq A$.
Heavenly Philosophy
So, $\operatorname{range}(g^{**}) \subseteq \operatorname{range}(g) \subseteq A$
Heavenly Philosophy
And because of the bijections, $|\operatorname{range}(g^{**})| = |A|$.
Heavenly Philosophy
I have to work on the names so they're not as confusing, but that's an idea for me.
Then, it's easy to prove that $|\operatorname{range}(g^{**})| \leq |\operatorname{range}(g)| \leq |A|$
Heavenly Philosophy
Actually, I don't need to prove that injunction then.
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.
Heavenly Philosophy
What
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...
Hi
Hello!
hello! 
How is everyone tonight?
Tired but ok
nice! any plans for the day? :o
Thank you🙌
I hope you got a good night's sleep 
$testing \sum_{i=1}^n i^2 = \frac{n(n+1)(2n+1)}{6}$
Riven
I need to write website content and sleep for a meeting and busy day tomorrow.
sounds like you have a lot on your hands 
good luck with the website, rest well, and I hope tomorrow treats you kindly c:
Thanks. What are you up to?
still working on some math problems, though I should really be doing my actual homework 
going to go to bed soon
gotta wake up in 7ish hrs
Hello how’s it going?
Sum of squares
Same
can the sss congruence rule be proved ? i know sas rule is an axiom (silly ques)
without using any other congruence rules
If you assume you somehow know SAS then from the three sides of the triangle you can produce one angle using the cosine rule and use SAS
but we are using SAS right? is there a way without congruency?
Whats your definition of congruence anyway
in simple words, two figures with same shape, size?
Yeah but then what do we mean by same shape and size
the angles and sides are the same
The problem is that its vague so we dont have anything to start with
Yeah then if you have SSS
Then that means the sides are the same alr
oh..right..i get your point..so basically we will have to assume a startpoint to begin with?
And cosine rule gives you the three angles are the same
Yeah
You need a start point to work with
And this is a good start poiny
Now you can think why SAS is enough to show the sides and angles are all equal
Or why SSS is enough
@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.
Hi
Hi
yo
Me too lol
fr ?
That's so easy
What's your age
17
im studying for my finals of highschool
exam is tmrw
and i dont understand probabilities
at all
belgium
yeah
i mean
iml home schooled
but i have to study
and pass exams
every now and then
this is my last one
after this
i graduate
Give me a pic of question
accept friend request


All good pal?
I'm good too. Thank you for asking.
People should talk here.
Why do you think so?
I think we should go there where the crowd is.
Okay. You should wait for it. Good luck from here.
Cream stew
@mint canopy what other roles are that are related to "active"
Helpful is also bot assigned and based on activity
Oh, I didn't actually know that
Helpful is like specifically in the help channels?
Also it seems like it takes a lot of effort to get these roles
I am very active for some time now
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
It doesn't take a lot of effort, you just have to participate in the actual math channels.
thats the only channels I participate in xD
Cool
If you are worthy, the bot will know.
What bot is this
@quasi jetty
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.
Is this a high school course or something in university?
Matte1C in Gymnasium in Sweden, which according to GPT roughly translates to Algebra II and a bit of precalculus, in high school
Just master what you study at school first and you can find everything yourself on the internet
well okay that's fine
how comfortable are you with the material being presented?
I’ve already worked with the exact same mathbook at my previous school, that we’re working with now. So very comfortable I’d say
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.
Yeah
That's good
Are you looking to get into pure Mathematics or do you wanna know more math for applied purposes
Because that sorta leads you to two different tracks
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
These are usually something like linear algebra, analysis or abstract algebra
And there are introductory texts to all three out there
I think that as long as you dont disregard your current school work, you won't miss anything important. You could learn Calculus I in your free time, or whatever you are interested in. There is plenty of material available in the internet, such as the courses the MIT uploads to youtube
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
Ded chat
no
epic embed fail
Welcome to the server @thick sorrel @wheat mauve
thanks
o7 charlie
ive seen some people get very active in under a week
but tbf, i think the people who do get it are chronically on this discord; atleast a convo every 2-3 hours
Welcome to the server @shut axle
we got active in a week and a half, VA in a month
Aren't you in topic channels too
not enough
we're mainly in discussion, adv lounge, math disc, and books
Only discussy grinding
bro im failing math
i got a 13% on my last test
chil
sometimes in life
you will have to fail
but through failures you learn
welcome @shut axle
Remove distraction focus on targets start with easy topics or what makes the interest in it. And do streaks.
Same to myself.
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!
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
Just tryna reach out to ppl who might be interested in my work
:3
I need someone who can teach me trignometry in zoom
Why zoom
Why on zoom you can ask for questions and your doubts here on the server itself
ok
i know why on zoom (or literally any other call app) because its more interractive and fast and cooler than texting
Ok its a personal choice
subjective
Hmm
nobody here
To ask for mathematics help on this server, please open your own help channel or help thread. See #❓how-to-get-help for instructions.
Bro why you hate me 😭
evil move 
im not but ur just weirdo for saying that
well it’s weird for me bc im a woman
oh, that is wonderfully taken out of context 

<@&268886789983436800> advertising
(i told him to post it here and it's not being spammed)
oh
we didn't know, sorry
Soy una rana
u sure ur 17 bro?
yes sir
How do yall fell about Matrixes
i despise them
Why?
i think its a plausible concept
they’re pretty cool
tho not in the advanced ai way
GCSE Further maths matrices were alright but at A Lvel FM theyre a nightmare
i just hate the rotation gimmick
IDK how it works there
Matrices are just representations of linear transformations between two vector spaces V and W with bases \beta and \gamma respectively
A rotation matrix is simply an element of (\mathrm{SO}_{n}(K)) where K is a field
James + Ryan (TCC)
ill go work on it since I have to for exams as well as set notation since it looks so weird, but thanks
take the 2x2 case (\begin{pmatrix} \cos{\theta} & -\sin{\theta} \ \sin{\theta} & \cos{\theta} \end{pmatrix})
James + Ryan (TCC)
i only remember the identity matrix 😭
now this is a linear transformation (T \colon \mathbb{R}^{2} \to \mathbb{R}^{2})
James + Ryan (TCC)
It's matrices and they're terribly overused
Not quite
A rotation is an element of the kernel of det on O(V,B), the group of isometries of a metric vectorspace
Det viewed as a morphism from the orthogonal group to the multiplicative group (+1,-1) in K
Over a quadratically closed field, and for nondegenerate spaces, it indeed reduces to a single parameter n
Over a euclidean closed field it reduces to two, p,q (this is sylvesters law of inertia)
For example just over R we have SO_1,1(R)≠SO_2(R)
Sorry, English’s not my first language
1+1 = 2
Wdym they’re overused?
Unless you are wishing to exclude spacetimes and other mixed signature rotations.
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
Everyone knows Linear Algebra 1
No
who pinged me
Even the 8-year-old I saw on YouTube
What are you saying
I have a friend who’s horrible at math and doesn’t know basic algebra
He got a 0 in math last school year
But he still passed
I dropped out of high school
Mathematical nonsense
Not only does not everyone know LA 1, but that's a nonsequitur anyways
Oh that's really cool
Yes this is going to be my next big topic once I define clifford algebras in my notes
I want to learn about how the classification of the orthogonal groups differs from that of the metric vectorspaces they attach to
You learn yourself?
You should learn PDEs
Basics atleast
the classifications are essentially the same
For example, (R^n, g)≠(R^n,-g) with g the standard dot product, but their orthogonal groups are the same
but also good to work through the details
actually it's a pretty subtle point whether you're actually meant to think of these orthogonal groups as the same or not
hello I am y13 and I want to apply for cam maths does anyone have any advice on how to prepare for the step
Also Q^2 with (a,b)->a^2+b^2 and Q^2 with twice that form should have the same orthogonal groups
No?
Interesting
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
Really? Good to know
Maybe some day
this comes up a lot when trying to correctly formulate things like the local or global Langlands correspondence correctly
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
the set of inner forms of G has a distinguished basepoint, namely the quasisplit inner form G* of G
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
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
Inner forms=Isometry groups?
no so like inner forms arise when you use Galois cohomology to classify linear algebraic groups over non algebraically closed fields
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
in other words you want to classify objects X over F which become isomorphic to \bar{X} over \bar{F} after base change
such objects X over F are classified by classes in Galois cohomology H^1(Gal(\bar{F}/F),Aut(\bar{X}))
you get inner forms by replacing Aut with Inn, and outer forms by replacing Aut with Out
inner/outer automorphisms
0->Inn->Aut->Out->0
when you're talking about groups the inner automorphisms are just those given by the obvious conjugation action
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
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
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
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
Interesting perspective
Too far for me, I know neither galois theory nor (co)homology
maybe some good motation to learn some group cohomology
you only need H^1 and occasionally H^2 for this story and these can be described very explicitly by hand
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)
H^0(G,M)=M^G is G-invariant elements of M
H^2(G,M) is equivalence classes of group extensions M.G
Math is lowkey goated
lowkey?
Also I'm deeply disappointed in myself that I took issue with that part, rather than with the absurd word "goated"
Old moment
Real shit
nG I was interested if you knew a field in math that's the intersection of non commutative geometry and low dim topology or is this not possible?
@vale pumice what did you want to ask me
... you wanted to catch me to help you with a math problem?
open your own help channel.
#❓how-to-get-help for instructions
#help-14 is free right now -- type something there
I changed my mind theyre actually alright now theyre pretty useful
Hello

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?
Think about how these partition into outer forms first
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
you classify them by Satake diagrams which is just the usual Dynkin diagram plus additional decoration and folding that keeps track of the Gal(C/R) action
Ah yes, I remember reading about this in Springer
but yeah for example all the su(p,q)'s are inner forms of each other
the real and quaternionic forms are distinct from these
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
for n>0 fixed the real groups U(p,q) with p+q=n constitute an inner class
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
for a given U(p,q) there are p+q choose q such representations
these sets as p+q=n varies form this set of |S_\phi|=2^n many representations
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
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
@acoustic kestrel Hey any news on the mext exam? 🙃🙃
Nobody reads it like this
shes reading it to the xat
Thoughts on physics
It’s cool
,w sonic like curve
(x-1)/6=11
(x-1)=66
x=67
SIX SEVEN
💀
What the helly
Welcome to the server @heavy condor
@polar temple I’m switching to physics, decided
nice
From Bio to Physics
thats a very appropriate decision
i‘m sure you‘ll find more happiness and … less job opportunities here

LMAO
Thank u
I’m hoping I can get into a double major of Math and CS
U didn’t have to say this much of truth 😭 🥀
💔💔💔💔💔💔💔
boom 💥

this would be if i owned a pet fr
interesting
thats not a pet
its fumo from touhou
physics is a cool subject too
ye
I mean I picked physics instead of biology this school year
I still wanna do the double major
oh lol
fair enough
good decision (biased pov from another maths+cs guy)
ok lmao i though u were replying to fumo gif
but its the cat
that will be me too if i had a pet 
LMAOO
at least McDonald's saves computer science graduates from unemployment
hmmmm
not sure if its worth it….
worth it if u cant find a job
Is it nano tech worth it I find it interesting
probably
SYBAU
Erm
hello higher im doing good what about you 
@fresh comet Higher!
higher! 
I'm doing well c:
higher! 
has anyone used chatgpt to learn math?
i love scrapping things
no
evening folks
i’ve tried. it doesn’t really work
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
i called one out & this damn robot that exists in the wires started talking to me about making a typo… 😭
yeah lol its kinda meh for math
I hath been summoned
Sometimes it’s SO sure that it’s right but I was persistent it’s wrong. I always win. And I’m right. Gotta check those facts
Or maybe u didnt idk
It’s unreliable
no I'll be honest the mod ping that went off earlier rlly confused me bc I was wondering why someone was pinging me in a help channel and was about to be mad they were pinging to ask me for help
Lmaoo
Congrats on blue name @thorn wren
Finally got VA :)
any computer science student
Yess
which stands for "virtuous asshole"
"doesnt it mean very Active"
yes but they've been very active for a long time
Ah ok
Ahh ok I get it 🤣
any electrical engineering student?
used to be
I guess im virtuous asshole then 😭
why are mathematicians so unhinged
What is this intended to mean
why are discord* mathematicians so unhinged
Because it’s discor
Because many are terminally online and many people have absolutely zero manners or respect for the internet as a whole
Tru
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
Middle left
Meanwhile any SSC aspirant here?
I need people to rant about its subjects
bread catto 

too ez
why again
@outer saddle hyy?
What is SSC?
i see like 30 dogs
Welcome to the server @tulip geyser
whats ur guy's favorite derivative notation
i think euler notation is sadly underused
Damn
[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
what if we added a vc to math
this server used to have a public vc but it was hell to moderate #changelog message
assuming you meant that
ya
Wondahoyyy
Everyone asks where's the cat but no one ever asks how's the cat
be wary of physics discord
most of discord is a work
yeah it’s crazy how much corruption there is nowadays
the fallback is IRC
But there are only 2 or 3 decent networks
Service selection commission. It host several competitive examinations for various post across India.
Welcome to the server @serene burrow
hi
u could unlock secrets in here if u become active or booster
So relateable so emu
All the better to mute you with 😈
we usually ask for permission
really went down the deep end
real
,av despairful_deltoid
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
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
I am still trying to understand what you said. Consecutive future/past merge together or all middle steps erased? Meaning p-p-f-f-p becomes p-f-p or just becomes p?
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)?
english is not like math but yeah you can say that two ps collapse into one p and 2 fs collapse into one f like you mentioned p-p = p, f-f=f, p=p, therefore p-f-p but most times it would collapse further to either p-f or f-p depending on the sentence
In practice no more than 2 layers then right?
thank you.
english doesn’t allow condescension to collapse forms like that. you’d have to say smt like “if your sentence but a bit cleaned up happened, I wouldn’t have called him”
Oh
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
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?
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
yeah exactly, for example “would, will, could, etc” + “have, be+participles)”
would have or will be doing or would be doing etc
Thank you. I think I am getting it
sorry can you explain further what you mean
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”?
yes exactly! i think you’re getting it i just wanted to test you hehehe
feel free to reply or tag me if you have more questions that come up about this
and remember be wary of physics discord
if A had told me that had B told me that I had eaten, I wouldn't have eaten, I would have eaten

If you do very well in your 12-math class, you should be well prepared in theory.
3/25
and for my last trick, i will learn all about derivatives in 8 hours
This is unrelated to math, how would you guys make posters im kinda doing one rn
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
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
I mean like the layout because im supposed to make it on paper
because im kinda stuck on that
huh I haven't had to do a thing like that since elementary 
yeah im in grade 9 lol im kinda outmatched by everyone here
I guess just grab a pencil and trace some space for a title and two columns or whichever amount you'd like
:/
depends on how large the poster is supposed to be
wikihow is surprisingly good for questions like this https://www.wikihow.com/Make-a-Poster
where you're kinda stuck on how to do a common (?) thing
So
I'm here, you lovely baguette
In TeX?
In maths
Btw I have 0 knowledge of advanced maths
But I used to do geometric topology in dimension four
What's your level of studies?
Congrats on being a teacher 
2nd year of undergrad
I shee
Not bad then, you will definitely help some folks out there!
Like the linalg questions from L1/L2 are quite common
I have to reread my notes before I start uni again
It hasn't started yet? 
I was about to say I need to review linalg 
Ah 
Nope
Starts on the 29th for me
Well, there's always analysis that pops up a lot as well 
What level are you teaching in hs?

But they're not very good 
No maths expertes
Oh 
3 hours into a course of "révisions et complément sur la dérivée", I have one asking me what a derivative is 

Didn't get it, no! There's only one such class and we're almost 20 maffs teachers here
Did bro skip 1ere or what
My grades in maths expertes were like so bad
More than enough, we have 14s helping here.
Because of what chapter?
Arithmétique
Ah of course
But the freaking modulo killed me
Arithmetic is hard because there are proofs
I hate matrices
Students dislike those 
It was impossible for me to get the logic
Endomorphism algebras are great though
It was jus too absurd for me
How come?
Because I hate coordinates
The thing is I had one of those teachers who expect you to understand right away
And bases
≈ you hate algebra
Well, in this case it's hs stuff so it's like 4x4 at most, and typically they're transition matrices for probabilities stuff and you're given the diagonalization (the vocabulary isn't used)
No, algebra is fun
I shee
That's why I hate matrices
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"
Matrices reduce it all to the boring algebra and a bunch of computations
💀
Oof
Keep your perspective on linear maps for cool shit
Maths spé was fun tho
Which chapter did you like most, and which did you hate most?
It's a shame your not doing 1ere, I would love to know what it's gonna be like preparing the new exam
I'm curious because I will have students hating some of them 
Hmmmm
I enjoyed all of them
I had a 1ère last year, but just because of this new exam I decided against it for this year!
Favourite integrals
I shee 
Since seconde I would see the symbol and I really wanted to undertand them
Oh I shee
Least favourite
I'd say
Suites numériques
Not convexity?
Jusy because récurrence is too much manual labour lmao
Or, worst: statistics
JESUS THIS ONE
Some day you'll write "par une récurrence triviale, on a [...]" and never write down said induction
The second derivative was always so looong to calculate
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
Ah yes the famous "demonstration triviale laissée comme exercice pour le lecteur" 
But si don't think I'll need récurrence
Annoying too indeed
Especially as I had all the program
I'm legit scared to teach stats, because I hate this stuff and it's awful as heck
Also I suck at stats 
Well, BT is "Markov à l'ordre 2" 
Hmmm
Or "Markov pour X^2" 
-# what's this Markov thing
,tex\makebf E$$\PP(|X|\geq\alpha)\leq\frac{\EE[X]}{\alpha}$$
Hmmm
TeXplotlib
PTSD incoming
\makebf ESo if you use this for the variable $(X-\EE[X])^2$ you get BT
TeXplotlib

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
What Licence are you doing?
Astrophysics

I suppose my diff geo background would help me now too 
Do you have orbital mechanics classes?

I swear quantum mechanics made more sense it's crazy
You should play some Kerbal Space Program

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
,,G\frac{m_Am_B}{r^3}\overrightarrow{AB}
TeXplotlib
But that's nothing compared to oscillators
That's like the best thing ever
It's r^2
Nightmarish 
It's r^3 if you don't use a unit-length vector 
Wait, really?
Yes
And Schrödinger equation
Needles to say in term 2 everything made so much more sense 
Hi
Hey
Like wtf, you're doing this and not even ordinary DE's 
Hello how are you
We did ode's
But yeah the order was fucked up
Good and you? 
Good also thanks for asking
You new here? 
Yes
Welcome then!
Thanks
Wait so I believe you have beautifully written lessons for your class Matty 

But I can show you some, sure
Holy hell of course I do, I wanna keep my sanity!
So you're already superior to most of the other teachers using Word
So where are you from
Good lord you have no idea how many of those there are 
I'm a baguette 🥖
An example of how the notes I type look like (yes I took one that had a nice picture!)
Wbtu
That looks super good!
Sry but what is baguette
I'm french
Nigeria
Oh nice to meet you
Also, I don't know if you've ever seen the proof of the fact that $\vec u\cdot\vec v=|\vec u|\cdot|\vec v|\cos\theta$?
TeXplotlib
We also learn french in Nigeria
I think I did
Tbh I don't remember but I have a vague memory
I was gonna post how they look but I can't in this channel 💔
Noice
Ahh this proof is nice
I read it in a statistics book the first time
I can't read this but it was presented similarly
Really? 
I don't think I've seen it with the trigonometric circle
Yes
The book is called Applied Multivariate Analysis I think
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 
I made this proof myself 
It's quite annoying how it's never proved lool
I feel like that should be the first thing shown
It should be left till the end of the chapter though!
Cuz it's a bit technical tbh
Especially for high-schoolers
I don't think so I think it's pretty simple and elegant
Oh maybe
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
They gotta learn the hard way 
It was a long time ago
It's nice that you have proofs
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 
Before I touched set theory 😂
Are you still working on topology besides?
Based, why are we laughing
Fr
Made with a macro?
Of great importance in GA
I wish I did, but you don't get enough time, and also it's veeeeeery hard once you leave academia, despite what they tell you
Nice
Binomial theorem

Now prove it
Holy heck I did it manually
what a fkin noob I was 
Oh no I remember
I did a Python script that generated the TeX
Why would you make this

Kek
Wdym
Oh that makes more sense
I think that can be easily done in TeX
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
Ikr, now I'd do it in plainTeX indeed
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}```
Typst
It's not too bad
💀
For infty
Not bad
Typst is nice for things you don't usually care about in markdown languages
I don't think you've got any idea of how bad I was at LaTeX at the very beginning
Like loops and stuff
LaTeX has those too
Heck, can typst do that? 
I still have no clue how to effectively take notes
,,\fact{123456789}
In latex
i mean it's turing-complete
i think
TeXplotlib
I personally don't take notes with LaTeX
So is latex
TeX is too 
yeah i know
A good old notebook with a pen >>
Good for computation
But I like condensed information to be in my notes
i mean that typst is turing-complete so it can do any computable thing that its I/O supports
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
Oh hello eta carinae 
Topology seems cool

But hey, you can make drawings 
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 😭
Ankaa, did I tell you I had an average of a bit above 1 picture per page in my ~200 pages thesis? 
You're studyin maths?
Like all the time will just be spent learning the foundations I don't have
Probably just going to wait for next semester and I can learn topology alongside analysis
No you didn't 
No way on Earth I was doing those figures in TikZ 
Me?
Yeah
The zero dimension topology where all open sets are closed sets
Noice
Clopen
The weirdest topology to me was the Zariski one; it's not separated
\mathop\mathclose 
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
\mathclopen 
Clopen sets
Btw do your students know you're on Discord 
Probably not, because you know how the French high-schoolers suck at English 

You teach high schoolers?
Do you enjoy it

Yeah I do teach in hs, and I enjoy it... sometimes 
Are you teaching in an endroit paumé?
I wish 
I'm from the Gers
So I'm waaaaaay outside my comfort zone here near Versailles 
Where is Gers?

You got placed in Versailles 
West-NW of Toulouse
-# my geography isn't too bad see
Paris = caca
Never

I really disliked this city, sorry 
The south is much better
Same with Bordeaux
It's better than Paris, yeah 


What part of Paris have you seen to be so... negative 
You must've had a bad experience
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

But to be frank, I think the scale plays a big role in me not liking it
When I'll get the chance I'll go to toulouse
If you ever do, do tell me and I'll recommend you some places!
Sure thing!
I spent all my studies there 

Wtf, I spent 10 freaking years there as a student 

With chocolate inside
YOU KNOW HOW I CALL IT 
And it's not the right answer!!
Fun fact: there's a bakery somewhere that sells Chocolatine for like 10cts less than Pain au chocolat
You were muté à Versailles so now you adapt!
(in Toulouse)
Sadge
Wait
10cts?
Is inflation not a thing???

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








