The h Bar

0celouvsky

14:00

so you just do that and have to check that the group operations are smooth

seems reasonable

oh, it is in Lee

I need to sleep

Fawad

@0celouvsky ode means?

Slereah

Ordinary differential equation

user228700

This is a great video:

Jaime Gallego

Ordinary diff eq

user228700

Can We Survive Curiosity?

►

ACuriousMind

14:04

@JaimeGallego Explaining one abbreviation with a slightly longer abbreviation might not be the best move ;)

Fawad

@ACuriousMind diff and eq are commonly used.

AccidentalFourierTransform

and so is ode ;-)

ACuriousMind

^my point precisely

Slereah

The ode to joy

AccidentalFourierTransform

smh

Secret

14:08

I like curiosity, because it gives me diversity

user228700

Also, @JohnR: The laptop has been heating up rather quickly these past couple days. Dunno what's up. Have cleaned the fan (from outside by using the blower) but problem persists. Please help, IT person :-P

AccidentalFourierTransform

anyone has the Gell-Mann matrices typed up in Mathematica?

Secret

However, curiosity does kills the cat, and not even satisfaction can bring back a dead cat (unless it is dead AND alive)

user228700

@JohnR: This, BTW, was what I was trying to upload earlier:

user228700

Secret

14:09

Therefore, one has to be careful of dangerous ideas and treat them with respect like any dangerous chemicals

2

ACuriousMind

@AccidentalFourierTransform I don't even have Mathematica installed :P

AccidentalFourierTransform

y tho

Slereah

It's only 27 entries

AccidentalFourierTransform

I guess my question is simple enough, so I can post it here

I need $\lambda^a\lambda^a$

Slereah

Just type it you lazy git

ACuriousMind

14:10

@Kaumudi.H I fail to see what's so terrible in that picture

AccidentalFourierTransform

it should be proportional to the identity (right?)

but I dont recall the constant of proportionality

user228700

@ACuriousMind Ah, well, perhaps you lack some context: I'm stuck in this cramped space full of people revising for the next 8 hours, till morning (3 AM) comes.

Secret

@Kaumudi.H are the chairs somehow hanging, cause it looks like you are on the second floor of the train and can see the first floor?

Fawad

@Secret after all every dangerous act does took to calm that curiosity to know what happens..

user228700

@Secret No, it's not a chair, they're berths to sleep in.

ACuriousMind

14:12

@Kaumudi.H I...guess I have trouble interpreting what I'm seeing in that picture. I can't quite tell what I'm looking at

user228700

@ACuriousMind It's the inside of a train and I'm sitting on the upper berth.

Slereah

@AccidentalFourierTransform it depends on the structure constants of the group

AccidentalFourierTransform

SU(3)

or even SU(N)

ACuriousMind

@AccidentalFourierTransform Well...that depends on the representation. But isn't that literally just the quadratic Casimir? You should be able to find the value of the Casimir somewhere in the literature

Slereah

Just write it as $[ \lambda, \lambda] + \{\lambda, \lambda\}$

AccidentalFourierTransform

14:14

I guess Casimir is a good keyword to google

Secret

@Fawad Well, here's an example. I actually have a curiosity on what it feels like to eat recreational drugs personally, but I am not going to satisfy that curioisity because it will mean completely leading my future ashtray

AccidentalFourierTransform

I was expecting something about characters, but that works too

ACuriousMind

Casimir is a good word, yes.

@Kaumudi.H Ah

AccidentalFourierTransform

its C_F!

scipp.ucsc.edu/~haber/ph218/sun16.pdf

Secret

O and btw you don't need to tell me what it feels like, because afaik the experience is highly subjective, thus it is as impossible to tell me what red feels like to you

AccidentalFourierTransform

14:15

first result in "su(n) generators casimir"

thanks :D

ACuriousMind

@AccidentalFourierTransform you're welcome ;)

AccidentalFourierTransform

in this case, $C_F=\frac{N^2-1}{2N}$

Slereah

Wikipedia has a nice formula for products of cadimir generator

AccidentalFourierTransform

how do you type the identity in latex?

Slereah

en.m.wikipedia.org/wiki/Special_unitary_group

AccidentalFourierTransform

14:19

blackboard 1 doesnt work

Slereah

Fundamental representation

AccidentalFourierTransform

ive seen people write boldsymbol 1

doesnt look bad but I dont like it very much

what do you people use?

ACuriousMind

@AccidentalFourierTransform \mathbf{1}

Slereah

@AccidentalFourierTransform \textrm{Id}

AccidentalFourierTransform

hmmm

Fawad

14:20

hmmmmm

Secret

I tend to use capital I

AccidentalFourierTransform

how about $\mathrm I_{N\times N}$?

Secret

For that I just use $I_N$

e.g. $I_3$ for 3x3 idetity matrx

Slereah

diag(1)

Secret

For general identity maps, however I use $\mathop{Id}_X$ or $\textrm{Id}_X$ where $X$ will be shown if it is important

AccidentalFourierTransform

14:22

$(\delta^i_j)_{i,j=1,\cdots,N}$

$f(f^{-1})$ works too

Secret

For tensors and components, the dirac delta does a good job on presenting it

Slereah

The identity map is obviously best written as $\{ (x,y) \in X\times X | x=y\}$

Slereah

14:46

Or yet better

0celouvsky

@ACuriousMind I just tried to play Skyrim

it froze .-.

Slereah

It is a cold place

0celouvsky

oh no

it works now

WHYYYYYYYYYY

I want to play this game now

I've forgotten how to hax the game

There's tricks like dwarven bows and shit to level up

I need to reinstall all of my mods

Slereah

It's not that hard to level up

0celouvsky

it takes forever

Secret

14:51

> The CMO determinantal wavefunction

(23) ΨCMO = det|...(φ1)2(φ2)2...|

depicts each MO as doubly occupied (evoking the difficult imagery of electron pairs stretching from pole to pole), whereas the corresponding NLMO determinantal wavefunction

Slereah

Or even just win with low level

Sneak and bow baby

0celouvsky

the best way to level up smithing is to raid dwarven ruins for metal

Secret

Uh, stop looking at electrons as if a particle please, chemists

0celouvsky

then forge it into bows, and sell them

buy more stuff, etc.

Slereah

Yeah

0celouvsky

14:52

also there's a glitch to get Prowler's Profit quickly

then you just make jewelry and enchant it

Slereah

There's a shitload of metal there

0celouvsky

that gets enchanting up very quickly

Slereah

Though you need to buff smithing first

0celouvsky

For alchemy you make the giant's toe potions

@Slereah ah, you mine iron ore, silver, and gold

make basic jewlry and stuff

Slereah

Mining isn't easy

0celouvsky

14:53

that gets you to 30, then you can make dwarven weapons

Secret

> sensibly depicts each pair as occupying a distinct localized site. Despite the obviously greater interpretive difficulties of (23) compared to (24), the two wavefunctions are

Slereah

Not that much ore around

Secret

> actually mathematically equivalent (as follows from Fock's theorem [12]). The energy and other physical observables calculated from ΨNLMO must therefore be

> identical to those from ΨCMO, and any perceived "delocalization effect" arising from the unitary transformation of NLMOs to the symmetry-adapted CMOs (22a,b) must be purely illusory. Thus, NLMOs may be said to remove a superfluous tier of "unnecessary delocalization" that merely distracts from the chemist's Lewis structural picture, without physical consequences.

Slereah

Learher is easier usually

0celouvsky

there's multiple caves near whiterun with LOTS of iron ore

Slereah

14:53

Or buy ore

0celouvsky

and you can of course hax and wait a month or so in game so things replenish

Secret

ok fine, you have a point, nonphysical

0celouvsky

you can level sneaking by attacking the graybeards from behind

you can level block by letting a mudcrab attack you

pickpocket by stealing from carriage drivers or followers

destruction is hard to level

I got it to 100 on one character, don't remember how

you can also buy levels from people, but you have to do so wisely

such a good game

i once tried to write a guide on how to power game it

I got like 20 pages in, wonder if I still have it.

Bernardo Meurer

@0celouvsky I got rekd

0celouvsky

Oh no :(

@Slereah the crossbow + powerful enchnating is OP

@JohnRennie :(

Slereah

15:05

I miss morrowind

Morrowind had an acrobacy skill

To level up, you jumped

0celouvsky

so I emailed this guide to a friend some years ago

Slereah

So you just JUMPED EVERYWHERE

0celouvsky

I'm looking through emails from 2012

it's pretty embarrassing

ACuriousMind

@Slereah Have you tried replaying it recently? I have fond memories of it but I just can't into that RNG combat system anymore where you miss all the time although the weapon clearly connects

0celouvsky

wtf ACM

you made fun of me for not liking it

ACuriousMind

15:08

That was before I tried replaying it, I think. Nostalgia ia weird thing

0celouvsky

lol

Slereah

Morrowind did have fairly shitty combat

0celouvsky

ayyy

Slereah

Especially the first few levels

0celouvsky

these emails are so cringy

where is this damn paper

Slereah

15:09

When you missed most strikes

Great ambiance tho

ACuriousMind

indeed

Slereah

Also : no level cap

Which I appreciate

0celouvsky

oh my god

I used to name my pokemon after math terms

Slereah

You end morrowind as a golden man god

0celouvsky

Laplace the Ralts

Slereah

15:12

@0celouvsky Doooooork

0celouvsky

Limit the Torchick

Yashas

R.I.P Cassini

0celouvsky

I had a Maxwell's equations shirt

It was pretty bad though, it was the integral form

the cringe is so bad right now

I can't even

Bernardo Meurer

@0celouvsky When the prof posts the exam I will show you the questions

There was an integral that I just could not draw

Or rather, a set

I managed to integrate it on cylindrical coordinates

0celouvsky

Oh god

why did I do this

Am I a nerd?

AccidentalFourierTransform

15:17

Word

Slereah

I think you're all the way down to dweeb

AccidentalFourierTransform

:: eye twitch ::

Bernardo Meurer

Word??

0celouvsky

@AccidentalFourierTransform this was four years ago

Bernardo Meurer

That's proprietary malware

0celouvsky

15:18

idk what I was thinking

Bernardo Meurer

Send it to me

I want to learn tensors

AccidentalFourierTransform

@0celouvsky that is no excuse sir

Slereah

0celouvsky

@BernardoMeurer I cannot guarantee its validity

Slereah

You know thinking about it

Balarka Sen

15:19

@Slereah That

's creeping me out

Slereah

I think the bowtie was the fedora of the 50's

It was the mark of the dork

0celouvsky

@BernardoMeurer actually I won't send you this

it's private

I was pretty edgy

@BalarkaSen is a nice kid compared to this

Balarka Sen

compared to what

Bernardo Meurer

@0celouvsky Come oooooon

0celouvsky

I think I'm severely autistic

Balarka Sen

15:21

you think that's edgy?

it's childish, that's about it

Bernardo Meurer

You clearly don't know edgy

Slereah

Too late @0celouvsky

AccidentalFourierTransform

oh no I didnt read it

post it again

Slereah

I took a screenshot

0celouvsky

no

@Slereah why tho?

@BalarkaSen ok

Balarka Sen

15:22

to blackmail clearly

0celouvsky

actually this isn't even GR

Slereah

I knew you'd delete it you dork

0celouvsky

it's Frenet-Seret frame stuff

Loong

@0celouvsky Tourette physics?

Slereah

The heckin' Frenet frame

0celouvsky

15:24

oh no

the dreaded Colloquial Theory paper

paracetamol

@0celo @Slereah Hallo o/

Fourier and ACM too ^ o/

Secret

ok... so Natural Bond Orbitals then!

Slereah

My dorkiest moment was probably that presentation on nuclear energy I did when I was 9

It went unappreciated

AccidentalFourierTransform

I cant chat, I have been suspended for that picture

paracetamol

@JohnR: User @Always does have a point here:

2

Q: What moth is this?

Location: Rural area near the Western Ghats, Kerala, South India. Date: Sometime in December, 2016 Climatic Conditions: Humid, frequent rains. Brief Description: Couldn't have been bigger than an inch. Took the picture at night. Has characteristic orange stripes across wings and dorsal th...

:(

0celouvsky

15:26

ugh

paracetamol

@AccidentalFourierTransform Nah, you can still chat...they just barred you from using apostrophes ;)

0celouvsky

I didn't understand notation

I wrote $f(t):[a,b]\to\Bbb C$

Balarka Sen

rip

Secret

$$\Huge{\textrm{Time to begin Calculation Phase II!}}$$

paracetamol

@JohnR Admittedly, even I'm having an issue finding the species name for the thing >_<

sigh

insects.org/entophiles/lepi_059.html

ACuriousMind

15:27

@0celouvsky Just...look at how much you've learned, then?

Slereah

It's a bug

0celouvsky

baby einstein

AccidentalFourierTransform

@0celouvsky that notation is fine

Slereah

That's a cat

paracetamol

Tickles 0celo's cat

AccidentalFourierTransform

15:28

Currying

In mathematics and computer science, currying is the technique of translating the evaluation of a function that takes multiple arguments (or a tuple of arguments) into evaluating a sequence of functions, each with a single argument. Currying is related to, but not the same as, partial application. Currying is useful in both practical and theoretical settings. In functional programming languages, and many others, it provides a way of automatically managing how arguments are passed to functions and exceptions. In theoretical computer science, it provides a way to study functions with multiple arguments...

paracetamol

Gets scratched

0celouvsky

@ACuriousMind :3

ACuriousMind

@0celouvsky I do not recognize that cat, there's no physics or math book in the picture

0celouvsky

but I'm sure you recognize his chair!

paracetamol

@ACuriousMind Oooh! What (part) of the speech? No wait, which speech was it?

ACuriousMind

15:31

@paracetamol Why does it matter?

@0celouvsky I think I do!

Secret

@paracetamol Cyana perornata has the closest distributon of the 4 black dots to that image. It also depends on which region you saw it

Balarka Sen

cats are good

2

paracetamol

@ACuriousMind I'm a German WW2 history buff(sorta) ...though some people freely misunderstand that as "I'm a Nazi!" :/

AccidentalFourierTransform

dogs are better

0celouvsky

found the infamous Geroch email

fuck, didn't find the paper

I think it might be on my 128GB flash drive, which I have lost

Damn

paracetamol

15:37

@Secret Whoa! It looks like you nailed it! (Though I've no idea which one of @JohnR's "psychedelics" the biologist who named the thing was using. Cyana sounds like it's closely related to the colour blue which is nowhere on the moth). Thanks!

^ The Wikipedia picture matches!

Secret

It should be noted however that special classification in general is hard as phenotype does not necessary corresponds to its actual lineage

Qmechanic

I would appreciate it if someone could explain-to-OP/mediate/step-in/vote-to-reopen/vote-to-close here and here.

Slereah

@0celouvsky what geroch email

ACuriousMind

I think he might have misspoken and meant 't Hooft

paracetamol

@Secret True, that. :( But I'll take my chances :3

0celouvsky

15:40

yes, ACM is right

Slereah

I have some Geroch emails but they are not infamous

paracetamol

Ahem, @ACurious...speech please (づ｡◕‿‿◕｡)づ

Slereah

There are two notions of "metric" and "pseudometric" here: As
tensor fields on a manifold, and as distance functions. I always
mean the former (which I would regard as the more interesting).

Let's accept that definition. If I were doing this, I would
try to find an example of a (always, paracompact) (non-Hausdorff)
manifold that does not admit any (smooth) Riemannian metric.
My guess is that the non-Hausdorff manifolds are divided into
two classes: the well-behaved ones (that admit Riemannian and

Last geroch email btw

ACuriousMind

@paracetamol I'm the one who requested that we don't post it here, why do you think I would post it now?

Secret

@Qmechanic Too broad (also the new version as it currently stands, an exact word by word duplicate of the closed question). Even for the sake of argument and disregarding he is asking about a book review, his question basically boils down to "Is spinor basically a rotation element in a division algebra?"

ACuriousMind

15:46

@Qmechanic OP just now deleted both questions.

Secret

yeah, that just happened shortly (<1s) after I ping Qmech with my thoughts

Slereah

I guess it's up to me to find which non Hausdorff manifolds are well behaved

0celouvsky

Ok I had this flash drive a few weeks ago

i did a big cleanup

and now it's gone

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