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2:39 AM
sup
 
3:00 AM
More reflections on infinity as Chapter 5 of the book is just reached: Unreachability is not a unique trait of infinity. Dedekind finite sets can be indefinitely reduced in cardinality but the process will not complete in finite steps
 
 
2 hours later…
4:51 AM
@Secret that seems like a lot of inspirational rhetoric statements make sure you come up with a huge number of symbols never used before to accompany those new vague definitions, this will off put those sticklers that expect silly things like algebraic insight and allow you too keep the unreachability status quo needed to be a viral sensation consistently
 
 
2 hours later…
6:36 AM
\o \
/o /
 
 
1 hour later…
@Adam Ted will not allow this. It is one of the reasons I also post less here
Also:
The nature of voracious emptiness and how its insatiability when directed correctly, can be used to drive endless motivation
Emptiness, fundamentally speaking, is something which can never be filled in regardless of how hard you try.
It is generally considered to be a highly negative trait, because it uses the same mechanism as the carrot and stick. What is less known, however, is that certain kinds of emptiness, at least in the short term, can be used to lure ourselves to continue to do important but annoying things.
People have so badly misunderstood the nature of good and evil.
You have not experienced the violent, brutal means that good sometimes use to achieve its goals
You have not experienced the experienced, calculating and mindless motivating means evil does things
Good and evil, ultimately two sides of the same coin. They only differ because of moral systems
While moral systems are relative, at least for us the entire human society, we do have a commonly agree standards, and hence, we have a sense of what is good and evil
Good is something you do not worry about it going in excess, evil is the opposite
In the end, it is all down to dosage, just like a poison can save lives at the correct dose
Having said all of that, manipulating cans of evil takes intense training and skills. It is more dangerous than the madness of infinity, or the excruciating death of hydrofluoric acid
It is not for the weak willed, nor for the faint of heart
and I, being just a normal human being, have no authority over evil
Sympathy is the liar. It only cares about what feels good
It does not care what the person really is
Empathy dives deep and learn the truth of the person, and respect them as they are
 
7:56 AM
@Secret Keep the meta-rambling out of math chat please
5
 
8:33 AM
@Secret I'm sorry it doesn't seem to have transferred in text as I expected, I was being incredibly facetious
 
Well you always are, and I still don't know enough to translate the language
so apologies...
 
hello
 
9:08 AM
hello?
 
HELLO
He is risen
 
9:37 AM
@s.harp The group theory question I had in mind is this:
What other groups besides the mapping class group satisfy the tits alternative?
and what reason does one have to believe whether the mapping class group is linear or not?
 
Hmm, doesn't it have all finite groups as quotients (or is it as subquotients?). Which would make it in some sense too "large" to be linear.
 
subquotients
 
Ahh, right, it has all $SL_n$'s as quotients, right?
(over finite fields)
 
I think so, but I'm not entirely sure...
 
I think whatever result it is I am trying to remember correctly is due to Massbaum
 
10:01 AM
$$\int_0^1 \sqrt{(h'(x))^2}~dx=\int_0^1 \sqrt{\frac{e^{2/\log(x)}}{x^2\log^4(x)}}~dx$$
I need to work this integral out
 
If $f:\Omega\to \Bbb C$ is a holomorphic map, and $\Omega$ is a simply connected domain, with $\gamma:I\to \Omega$ a closed loop. Is the following correct?

$$\oint_{f\circ \gamma} \frac{dw}{z-w} = \int_0^1\frac{(f\circ\gamma)'(t)}{z-f\circ\gamma(t)} dt = \int_0^1 \frac{f'(\gamma(t))\gamma'(t)}{z-f(\gamma(t))} dt = \oint_\gamma \frac{f'(y)}{z-f(y)} dy$$
 
Are random walks ever done on 2d surfaces embedded in $R^3$
 
What do you mean by 'ever done'?
 
3d lattice random walks are studied but I am not sure if they are studied
 
I'm sure random walks on surfaces embedded 'nicely' in R^3 are studied
 
10:09 AM
nice
I believe you
 
I imagine one could be interested in random walks along geodesics?
 
like going back and forth
on a geodesic line?
 
Well, one need not go back and forth. Say you are taking random walks along geodesics on a sphere
Where at each time step you walk along a random geodesic some fixed distance
 
oh
or random walks on step functions
or make a random walk that is distributed like the PCF
 
Is that a family of biased random walks on a sphere?
 
10:21 AM
biased random walks through disk
 
Oh okay, I was visualising it as the top and bottom being north and south pole
 
sort of like this
but deformed a bit
@JackDon
what's your math level
 
my math level is different depending on the thing
 
what's your math level on your best day with your best area
 
I know some advanced topics, and lack knowledge on some basic things
 
10:28 AM
7?
on a scale from 0 to 10
 
I know what an infinity-stack is, but I don't know complex analysis for example
 
okay
 
So phd level in some areas, and early undergraduate in others
 
what question
are you trying to sovle
 
in complex analysis or in terms of infinity-stacks?
 
10:31 AM
anything
 
Just learning about the residue theorem right now
Why did your newest question have its head chopped off @Ultradark
 
noice
@JackDon
it doesn't change the question
so i just left it
$$\int_0^1 \sqrt{\frac{e^{2/\log(x)}}{x^2\log^4(x)}}~dx=1$$
i like that answer
 
Well it would make it read much better if you edited it
It looks confusing to start with that
 
10:51 AM
 
space filling curve?
 
geodesics on a torus
 
Doesn't look like a random walk though
 
yea its not a random walk
 
there are lots of other geodesics too
 
10:52 AM
like?
 
The ones that follow the standard generators of the homotopy group
 
yep
 
Like the perfect horizontal and vertical ones
 
ye
p
@JackDon if you draw a path that goes from a intersection of this grid
to the next intersection along the diagonal
you can recover the standard generators
 
11:10 AM
so here's a question I have for you, or anyone
take all diffeomorpisms of that mesh
consider finite mesh
 
That donut looks delicious
 
and analyze
properties of the mesh reaching equilibrium with the mesh in the picture
ie "amount of time" for the mesh to snap back to its original form
you might try f-harmonic maps
 
11:38 AM
@RyanUnger yeah i saw this
how good is it
 
 
3 hours later…
2:08 PM
@BalarkaSen tbh I don’t know. I’ve never heard of these spaces before
But these wedge metrics do seem to be popular
 
 
2 hours later…
4:02 PM
@RyanUnger the metric they consider seems pretty simplistic; near the singular stratum it looks like a cone on a principal bundle with bundle group acting on fibers by isometries
but maybe this has applications in equivariant setups. idk why positive scalar curvature metrics are a natural question here
 
that's literally what an edge metric is
uhhh somehow this all goes back to Gromov and his dream of defining psc for metric spaces
 
aha
why tho lmao
that madman
 
because you can do it for sectional curvature and Ricci curvature
 
can never make out wth he has in mind
 
he has some reason in his big list of conjectures
something about psc being an octopus
 
4:06 PM
lol
i cant understand lol
 
I don't know how to respond
 
4:58 PM
oh god
 
@BalarkaSen here's an edge metrics paper I found interesting arxiv.org/abs/1708.08211
 
For "their" opinions?
You mean women?
 
5:23 PM
Is there a name for a mono (resp. epi) preserving functor?
 
3 messages deleted
 
Just out of curiosity how does deletion work? I see two messages deleted by Loong and two deleted by Feeds
 
user132126
Manual deletion vs. accepting a flag, respectively.
 
Makes sense
 
6:27 PM
@Adam Last chance
 
7:26 PM
Hi @Ted
 
Heya, a @Balarka ... How you doing?
 
Not too great. Came back home for like a week with illness leave.
I might or might not have dengue
 
Oh no :( I don't know what that is :(
 
Some mosquito-borne disease that's potentially life threatening :)
 
Damn ...
I'm so sorry.
I'd have thought your cigarettes would keep the mosquitoes at bay.
 
7:29 PM
My college campus is having a dengue outbreak. I developed mild fever yesterday so came home immediately today.
 
Oh wow.
I'll think positive thoughts for you.
 
@TedShifrin Consulted a doctor, who said it's probably just lung infection of some sort (which makes sense, because I have massive sinus and congestion right now and the fever went away). I do a test tomorrow anyway.
@TedShifrin Thanks!
 
I have suffered from sinus infections a lot. Really debilitating. I recommend using the neti pot.
Oh, if the fever went away that's encouraging.
The flags and bans are getting out of control in here ....
 
Yeah all the guys who had dengue had like sudden fever which charted at 104F and didn't go away after paracetamol.
Mine is barely fever, it's like not even 99F
 
Oh, that's sorta normal if you're suffering from sinus/lung s***.
 
7:32 PM
Ya
 
Quit the damn smoking.
 
The lung thing is probably caused by smoking tbh lol
ya
 
I'll have to smack you repeatedly.
 
doesn't the neti pot give brain amoebas
 
if u use bad water
 
7:32 PM
Not if you use distilled water or boil the water before using it.
 
dont use neti pot with toilet water in it
thats a good start
 
TBH, I have never bothered with the former, do bother with the latter sometimes. I'm still alive.
 
yeah if you have lung problems you should probably stop smoking Balarka
 
I actually love using it ...
 
or switch to cigars
 
7:33 PM
Smokers rarely heed advice from us non-smokers.
 
my dad smoked for 50 years and quit cold turkey
 
its quite easy to go cold turkey on cigarettes actually
much easier than stopping slowly
but like ehhh
 
he did every tobacco except for cigarettes
 
Hi everyone
 
7:35 PM
hi
 
heya demonic @Alessandro
 
What kind of math has everyone been thinking about lately?
 
still working on the power set of R^n
 
A clusterfuck on my side tbh
 
I never think.
 
7:37 PM
@RyanUnger well there's a lot of stuff in there
 
yeah it's a big set
 
I want to write a few things about cohomology and thermodynamics as something fun and time pass
 
uhhh
 
With thermodynamics there are lots of non-closed 1-forms.
 
It's like barely math, just something I noticed during my Physics-II class
 
7:39 PM
imagine having blarka in a freshman physics class
 
@TedShifrin $dU = pdV + TdS$ is (the coordinate description of) a contact form, I think.
 
Yes, those are all actual differentials, but if you write $dE = dq-dw$, $dq$ and $dw$ are not. $U$, $V$, $S$ are all called state variables.
 
Ya
Physicsts like to call closed 1-forms as exact differentials :P
I mean I guess they always think locally in thermodynamics. The state space is just a coordinate patch
It's just funny
 
Well, they actually mean exact $1$-forms, so they are exact differentials.
As I said, you have differentials of actual state functions.
 
I'd say locally exact 1-forms.
 
7:43 PM
Nah. Entropy, free energy, etc., are global functions on your "system."
 
There's no real guarantee that the state space is Euclidean, they just choose it to be because locally it is
 
So what?
I recommended (on MSE) a book I once owned that had a rather mathematical treatment of thermodynamics. It was a Springer book.
 
@TedShifrin There's no real definition of entropy as a function on the state space of the system, there's just the Carnot-like argument which proves that $\delta q/T$ is closed.
Only by assuming it's Euclidean you get a function, the antiderivative of the closed hence exact form.
 
There's a statistical thermodynamic definition of entropy for sure.
 
Oh yeah I don't know that
 
7:45 PM
No, keep reading. I believe I'm right.
I took two P Chem courses. They were among my favorite courses in college.
The chemistry majors in there hated me :D
 
lol
@TedShifrin I'd like to know the name of this one
 
hmm so there's the norm $N(A)=M(A)+M(\partial A)$ and when this is finite the chain is normal. So is $N$ the normal norm?
 
let me barge in here with an unqualified statement: entropy is an anthropomorphic quantity and not a property of a physical system
 
It still has a statistical thermodynamic definition.
@BalarkaSen Here you go.
Unfortunately, all my notes and textbooks are long gone ...
 
@BalarkaSen if you want to go crazy you should look at relativistic thermodynamics
it's not well understood at all
 
7:50 PM
I think a Balarka is sufficiently crazy right now.
 
My interest in the cohomology business is different and less colorful though: it seems the goal of classical thermodynamics is to come up with a good definition of temperature of your system. If $M$ is the state space, you can say it's a function $T : M \to \Bbb R$ (this is basically the statement of the 0th law). But then you want to measure this somehow, and which is what Carnot's theorem (a corollary of the 2nd law) grants you: if you have an engine which takes $Q_H$ amount of heat from a reservoir of higher temperature $T_H$ and rejects $Q_L$ amount of heat from a reservoir of lower tem
This is basically saying that $\varphi$ is a 1-cocycle, which I'd like to call the "efficiency cocycle". And their claim is the efficiency cocycle is a 1-coboundary.
There's some hidden claim that the first cohomology group of the "temperature state space" is zero here, but maybe I am sounding like John Baez now
@TedShifrin Thanks!
 
Yeah, I think you'll find that book interesting.
 
not enough diagrams Balarka
somehow this needs to be an n-category
 
@RyanUnger Yeah lololol
 
8:57 PM
Hi chat
I’m trying to recall a remark I saw (dangerous, I know)
To the effect: if A and B are commuting Hermitian matrices, then there exists a function $f$ such that $A=f(B)$
Does that seem at all plausible?
(Probably not as stated, on the grounds that every Hermitian matrix commutes with the identity but $A=f(I)$ would be nonsense)
 
9:14 PM
Found my source for it and the sensible statement: If two Hermitian operators commute, then both can be written as continuous functions of some other Hermitian operator
 
9:27 PM
@BalarkaSen what's a good reference for PL geometric topology
 
10:05 PM
Hey y'all
 
@RyanUnger Linear Algebra: A Geometric Approach, of course
at least it matches two of the four words
 
 
1 hour later…
11:14 PM
New conjecture related to Goldbach:
4
Q: Every sufficiently large positive integer is the average of $n$ distinct primes for certain $n \geq 2$?

Shine On You Crazy DiamondI want to generalize a stronger Goldbach's conjecture a little bit because that might help solve it. I was thinking: For all $n \geq 2$, every sufficiently large positive integer $x \geq b_n$ is the average of $n$ distinct primes? Clearly this implies Goldbach's conjecture. So, was wo...

Probably has been thought of before, but no one's investigating it :)
It generalizes Goldbach's conjecture (for which there is no prize money -_-)
 
11:32 PM
Can you guys believe the comments I'm getting...
They're nitpicking over nothing
I made a valid generalization and conjecture. Enough said :)
 
11:46 PM
Hi, um.. so I'm trying to adapt an answer to a problem I have, but frankly I haven't had math in a long time and I'm struggling, if anyone doesn't mind helping me out.

My scenario is this: I have a roll that goes from 1-7. I want to know how long it takes (how many rolls on average) to get a 5 or higher.

https://math.stackexchange.com/questions/1119872/on-average-how-many-times-must-i-roll-a-dice-until-i-get-a-6
So uh does the fraction simply become 5/7?
 
no, no: you have a 1/7 chance to roll each number. You care about rolling 5, 6, or 7 --- so 1/7 chance to roll 5, 1/7 chance to roll 6, and 1/7 chance to roll 7
so there's a 1/7 + 1/7 + 1/7 = 3/7 chance to roll 5, 6, or 7
 
Okay, so why does the original question do 5/6? trying to understand it
Isn't it just 1 chance to roll a 6?
 
oh, sorry. i didn't look at the original question. lemme look at it now
sorry, internet died
5/6 is the chance that you WON'T roll a 6
 
Okay I see now
So if I model the same thing in mine.. it would be 4/7 is the chance to NOT roll what I want right
 
11:56 PM
Got it
Thanks
 

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