The h Bar - 2016-09-20 (page 3 of 11)

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user218912

4:00 AM

::braces self::

user228700

Yep, it is, in that I was born in that part of India which speaks this language and I converse with my family using this language but since I live in another part of the country, as I've attended school here and become an avid reader, I sort of became MUCH more comfortable with English.

Page 434 of Wald contains the following theorem: Let $N$ be an oriented, compact $n$-dimensional manifold with boundary. Let $v^a$ be a vector field on $N$. If $\dot N$ (boundary) is not null, then $$\int_{\operatorname{int}N}\nabla_av^a=\int_{\dot N}n_av^a$$
where the natural volume elements are understood. If $\dot N$ is spacelike, one must take $n^a$ to be ``outward pointing" if it is spacelike and ``inward pointing" if timelike. This result is correct, and is proved below. However, the claim under Eq. (B.2.24) in Wald is not, as it contradicts Prop. (15.24) in Lee's book. A similar sta…

user218912

@0celo7 TL:DR?

no screw you, read it now.

I had to go and type all of that just now

user218912

yeah right

user218912

4:02 AM

you had it typed up before.

Proof?

user218912

I saw it used in one of your answers few weeks ago.

@0celo7 Your mathjax is a bit off at places

Just saying

Well that's the only complete proof of the fact in existence.

user218912

@0celo7 i'm proud of you

4:02 AM

@SirCumference cuz it's copied from my personal TeX notes

not mathjax

oh

user228700

So I don't really have a first language. I am most comfortable with English but clearly, it's not my native language. And although Malayalam is supposed to be my native language, I use it only to speak to my family. I even think in English. Besides, I know how to speak 2 more languages very fluently so yes, I don't really have a native language.

user218912

@0celo7 you're right cuz I don't understand that at all.

user218912

@KaumudiHarikumar wtf? how can you not have a first language?

user218912

what are your first language(s)? plural.

user218912

4:04 AM

where you learned to read and write in first.

user228700

@IceLord Did u read the whole message? I explained.

Ok I need to actually get work done

user218912

same

For the record, it's "ask a question"

user218912

baiii

4:04 AM

same...

'night

@SirCumference wait

back me up

Yeah?

user228700

@IceLord Well, by that def., my first language would be (gasp) English.

Uh what?

I'm sorry I stuffed you in the toilet and all that

but I need your help now

4:05 AM

It's fine

Wait what did you say

user228700

Aaanyway, thanks for pointing that out to me. Bye!

@SirCumference If someone comes up to you and says "can I ask a doubt," do you think that's perfectly normal?

@0celo7 Context?

no context

user218912

@KaumudiHarikumar btw you're learning physics right?

4:06 AM

@SirCumference it's the language we're looking at here

not the vontext

@SirCumference Wunderbar.

You troll

user218912

LOL

Leave me out of this...

@IceLord did you screenshot

user218912

4:07 AM

no lol

user218912

:/

fudge

Crap

I should've written "censored by SOPA"

what's that

Stop Online Piracy Act

The Stop Online Piracy Act (SOPA) was a controversial United States bill introduced by U.S. Representative Lamar S. Smith (R-TX) to expand the ability of U.S. law enforcement to combat online copyright infringement and online trafficking in counterfeit goods. Provisions included the requesting of court orders to bar advertising networks and payment facilities from conducting business with infringing websites, and web search engines from linking to the websites, and court orders requiring Internet service providers to block access to the websites. The proposed law would have expanded existing criminal...

user228700

4:09 AM

@IceLord What's "learning"? In coll., u mean?

user218912

:32432736 just letting you know me and @0celo7 learned relativity and quantum field theory in high school so you probably can too. (disclaimer: I did not learn it as well as 0celo7 and I'm still learning it now)

user218912

so don't waste your time on high school level physics, you'll pick it up as you learn more advanced stuff.

what's a "quantum field theory"

@0celo7 What were you even asking about?

Who said that?

@KaumudiHarikumar

user116211

4:11 AM

Hitler reacts to SOPA.

user228700

@IceLord If you look at my chat profile, you will realize that I haven't got the time.

@MAFIA36790 TL;DW

user218912

@KaumudiHarikumar you keep asking about basic stuff you're learning.

user116211

@SirCumference bleh...

user218912

why not just jump into the deep end?

4:13 AM

@MAFIA36790 Great, now Youtube's recommending videos of the german national anthem

@IceLord b/c she's probably a normal person

user116211

@SirCumference oops ;P

That's just what I needed, coupled with the USSR anthem I hear every other day

@SirCumference Good. Better than that commie crap you probably listen to

a kid in my school sent me this

Soviet Techno Anthem Remix

4:14 AM

Report them to the local Klan chapter @SirCumference

they will be gone in no time

He just left me a napkin with a youtube link and told me to go to it

user116211

@SirCumference WoW!!

user228700

@IceLord That's a true statement.

@SirCumference My god.

I got Soviet Union 'Rolled...

4:14 AM

Are you at Columbia?

user116211

KKK vehemently hates commie.

There is no greater hive of scum and villainy

user228700

110

Q: Can "doubt" sometimes mean "question"?

I often see questions on Stack Exchange sites which I presume are written by non-native English speakers who use the word "doubt" in place of the word "question". Is this a case of misunderstanding the correct meaning or are people being taught that this is correct usage?

word-usage indian-english

@0celo7 Au contraire, have you ever seen the people in MIT?

user218912

lol indian-english.

4:16 AM

Everyone I know in Columbia hates those people

So you are at Columbia?

Not saying anything :P

Right now I'm not even sure if I want to stay in the school I'm attending

I might transfer

user218912

why are you so secretive?

b/c he thinks I will track him down and eat him

user116211

@IceLord He loves ambiguity ;)

4:17 AM

I guess for two reasons

he's not wrong, but it's still silly

Don't like to disclose much about me on the internet

user116211

@SirCumference same here

And I'd rather not come off as pretentious for my achievements or idiotic for my failures

user218912

@SirCumference yet you tell us the dumbest things about yourself.

4:18 AM

@MAFIA36790 there's a billion people in your country, narrowing it down to a few 100,000 won't change anything

@IceLord Shut up...

user228700

@IceLord Why is that funny? Anyway, I really have to go. It was nice talking to you about this. Thanks for teaching me this!(Although, I will come across as extremely pedantic and annoying if I start correcting the people here who use that phrase like that) Bye!

Never once told you guys my name.

Nick

I've told you my religion, but not much else

4:19 AM

Schlomo

David

user116211

@SirCumference bleh...

@0celo7 Who the hell is named Schlomo?

You just guessing random Jewish names?

user218912

@SirCumference remember this?

user218912

Jul 11 at 3:38, by Sir Cumference

As I have no idea what the opposite gender's...parts look like, I consider myself kind of innocent

Dog

4:19 AM

@SirCumference Schlomo Sternberg, one of the greatest geometers of the 20th century

Ahaha

I grew up pretty innocent

user116211

Many mathematicians were Jewish.

@SirCumference Have you since figured it out?

user218912

lol

I can link you some good material.

4:20 AM

@0celo7 Leave me alone, you don't know me!

I could be your brother for all you know!

user218912

lol...

user116211

;D

@SirCumference He has two kids, I think he knows what a vagina looks like.

Hmm, maybe you're a girl.

@0celo7 Well there was this one time I saw a nude woman running from cops

user116211

stop it, guys ;P

4:21 AM

Then you wouldn't have said "brother"

Nah, I'm a guy

So you're male.

She ran on top of a car, I guess she thought the police couldn't get her

They jumped right on her and arrested her

@SirCumference wtf are you on about

Are you proud that you've seen boobs?

"Well there was this one time I saw a nude woman running from cops"

@0celo7 Are you?

4:22 AM

@SirCumference No, I think it's a normal thing

I can also drive a car

Nothing noteworthy there

@0celo7 City life. Never bothered to get a license.

user116211

@0celo7, you have playstations?

user116211

@SirCumference cycling?

Ahaha, you can't drive?

@0celo7 You see, now I'm really pursuaded to disclose more about me...

Sigh

4:23 AM

Great!

user218912

@SirCumference because you say the dumbest fucking things.

@IceLord chill

@IceLord What? That I can't drive?

user218912

just be normal and be like "i go to school ___ and i'm a ___ major"

user218912

and nobody will say anything

user116211

4:24 AM

I mean @0celo, do you play games only on PC?

@MAFIA36790 I don't play video games any more

user116211

@0celo7 hmmm.

time spent playing video games is time spent away from mathematics

@IceLord I go to school ___ and i'm an astronomy/physics major

user116211

@0celo7 O.o

4:24 AM

Double majoring

user116211

great

@SirCumference Fill in the school

user116211

@SirCumference Astronomy?

Wait

Then maybe I'll go to med school

4:25 AM

hold up @IceLord

He likes the attention

user218912

?

Wait what

Put him on ignore

Wait what?

user116211

@SirCumference No more stalkers....

4:25 AM

@KaumudiHarikumar: Morning. What was the problem you wanted me to look at?

I said I'm not disclosing my school. You guys are taking this a bit far...

@IceLord I'll teach you how to be mean.

._.

user218912

@0celo7 k... only if you are.

First step to doing math well.

Yup.

4:26 AM

I don't...see how ignoring me will improve your math skills

Maybe I'm not at your level

user218912

I feel bad now. does that mean I can never be a true mathematician?

Yes.

@JohnRennie Morning!

user218912

:(

Oh, anyone here good with astronomy/calculus?

If you have compassion for that guy, you will have compassion for manifolds

but you might need to cut one in half

4:27 AM

Morning all. Judging by the star board last night's conversation was, erm, entertaining :-)

user116211

@0celo7: What does it need then to be true mathematician?

@JohnRennie You like astronomy, right?

no mercy

user218912

@0celo7 wait are you sure we use stokes theorem and not the divergence theorem back there?

@JohnRennie Did someone flag me tonight?

@IceLord same thing

user218912

4:28 AM

@0celo7 oohh true cuz it follows from stokes theorem

user116211

@0celo7 Ah!

@MAFIA36790 Wait, you like astronomy too, right?

@MAFIA36790 Proof by contradiction is evil.

You let the object have hope.

Then you CRUSH it

Uh, guys?

Take Euler's theorem. You let that list of primes think it's big shit. You tell it that it's the only list of primes. Then you FORCE THEM THROUGH PAIN AND ANGUISH to produce another prime.

It's...savage.

user218912

4:30 AM

is $\partial \mathcal{M} = \Sigma_\mu$ ?@0celo7

no

@0celo7 No, I meant the melons comment etc

user218912

what is it equal to?

what does that even mean?

user218912

i have no idea

4:31 AM

@JohnRennie No, I'm getting a spam warning and it's making me wait 7 seconds between posts.

user218912

since it's a surface integral right?

yes

user218912

boundary is a surface?

holy crap look at the tiem

@JohnRennie Uh...you there?

4:31 AM

@0celo7 spam warning? I didn't even know sucha thing existed.

@JohnRennie i get it daily :/

@SirCumference Hi

test

Ok good

Thought I was going crazy

@JohnRennie You like astronomy, right?

user image

user218912

4:32 AM

weird.

@0celo7 Happens to everyone

Has no one else ever gotten that?

When they post too fast

@SirCumference yes, though it isn't a special expertise of mine.

@JohnRennie Well, maybe you can help me

Just check if this math is okay?

4

A: How do I know, mathematically rather than from observation, if a moon is full?

The Moon phases can be defined by the phase angle between the Sun, Moon and Earth; for example, at 0°, the Moon is defined as full, and at 180° it is defined as new. If you want to know how bright the Moon is at a given angle, we would use the phase angle to find the apparent and absolute magnitu...

user218912

4:34 AM

@0celo7 the boundary is a surface right?

hyper

@SirCumference It looks sane, though whether the formula is correct I don't know.

@JohnRennie All right, thanks

@JohnRennie I need math help too

user218912

@0celo7 okay, and so why isn't $\partial\mathcal{M} = \Sigma_\mu$?

4:35 AM

@IceLord Go back to calc 3.

That makes zero sense.

user218912

I didn't do calc 3 in index notation...

What did you do it in?

user218912

vector notation

user218912

like bold symbol.

then write it in vector notation

do I look like I care what notation you use...

I'm in a bad mood

user218912

4:36 AM

:(

user218912

oh I see why it doesn't make sense

user218912

nvm

explain

user218912

because what does it mean to integrate wrt. to the boundary term?

what

user116211

4:39 AM

@0celo7 I worship you from now on!!

Good.

user218912

@0celo7 idk man i'm just tired, gonna sleep.

I need to convince some other people in this world to do that.

user116211

@0celo7 Can you convince ACM?

Ew, no. Why would I do that?

user116211

4:40 AM

@IceLord night.

user116211

@0celo7 I wanted to hear that; now you are my God ;))

@IceLord I've got a 1500 word lab report to start and finish.

I hate you all...

user116211

20

Q: Do 26% of Americans believe the sun revolves around the Earth?

According to a 2014 NPR poll 26% of Americans believe the sun revolves around the Earth. The survey of 2,200 people in the United States was conducted by the NSF in 2012 and released on Friday at an annual meeting of the American Association for the Advancement of Science meeting in Chicago....

united-states astronomy

@MAFIA36790 Oh no...

user116211

@SirCumference And it is true T__T

4:42 AM

@MAFIA36790 Wait what?

Who are you siding with, Galileo or the church?

user116211

@SirCumference I mean, it's on skeptics; and the answers there concludes the statement that over 20% American believe sun is revolving round the earth is true.

user116211

@SirCumference You misinterpreted me.

@MAFIA36790 Yeah, sorry

I have no opinion on the matter

@MAFIA36790 that proves only that 26% of Americans understand diffeomorphism invariance :-)

4:44 AM

Nah, I've heard stupid things, like 1/4 Americans not believing in climate change

user116211

23

A: Do 26% of Americans believe the sun revolves around the Earth?

Is there any evidence other than this to back it up? A Gallup poll in 1999 found that 18% of Americans thought the Sun revolves around the earth. So there is support for the notion that substantial numbers of people in the US hold this belief. A 2005 EU survey is reported as finding that...

But are you serious?

a) my opinion on the matter is irrelevant

b) I have no way of verifying it

The Sun going around Earth?

yes

4:45 AM

Goddammit

user116211

@SirCumference Trump?

user image

@JohnRennie ...what?

I don't understand it

user116211

I thought US people are enlightened and highly literate unlike our country.... bleh....

@JohnRennie Can you explain what "diffeomorpism" invariance is supposed to mean?

Afaik, you take the space of Lorentzian metrics $\mathfrak M$, then consider the moduli space $\mathfrak M/\mathfrak D$, with $\mathfrak D$ the diffeomorphism group.

4:47 AM

@MAFIA36790 a surprisingly large fraction of the population knows little about science and cares less. This is true in all countries.

2

@MAFIA36790 Yep

And then the Einstein equations are a functional on this space

but...into what?

@0celo7 Just get yourself a telescope

I'm not clear on any details

Follow Galileo's steps

4:48 AM

but we're in the realm of algebraic geometry at this point

and I dunno wtf is going on anymore

@JohnRennie A surprising amount of those people paradoxically love sci fi

@MAFIA36790 What about the God King?

Like the people who think dark matter is some pure evil desctructive substance

literally no one thinks that

@SirCumference I suspect the majority of the science apathetes have never read a book in their life, let along an SF book.

4:49 AM

user image

@0celo7 You think so?

user116211

@0celo7 Xerxes?

user116211

@SirCumference +2 O.o

@JohnRennie I dunno. My mother has 4 degrees and can't tell you who Hawking is.

Never heard of him.

The dumbest questions find themselves on Astronomy SE

user116211

@0celo7 He was the God-king of Persia.

4:51 AM

I know who Xerxes is.

"Are aliens real?" "What happens if you leave the Universe?"

@SirCumference if you asked me at age 12 I would have told you that interspatial warp drives definitely existed but physicists were too stupid to understand them. The question you flagged just indicates an enthusiasm that (temporarily?) outstrips the OP's knowledge.

user image

Trump would be the God-Emperor of Amerika.

@SirCumference What?

user116211

@0celo7 Aww! sure.

user116211

4:52 AM

@SirCumference Why would mark it favourite?

@0celo7 "fake cheating idea of Indian people"

@MAFIA36790 It was just too funny, I didn't want to lose it

user116211

@SirCumference ohh.

It was actually an edit on his original question

user image

user116211

@SirCumference yeh, I saw that.

He asked for a chance to edit it, and then changed the question entirely

Making it even more bizarre

@JohnRennie I think he went out of his way to make it a dumb

Calling it (pure evil)

I've seen some nutty answers too

4:58 AM

@SirCumference do your parents think dark energy is evil

user image

insert comment about Jews being evil

Look at that answer

A troll.

@0celo7 Eh, I've heard worse. One guy came to a chat with me and he had the username "WITHJEWSYOULOSE123"

After I stopped laughing I left

4:58 AM

@SirCumference You don't recognize trolls, do you?

@0celo7 Nah, I did

They're just funny sometimes tho

@SirCumference not a very clever username

user116211

@SirCumference Might be Neo-Nazi.

@0celo7 Eh, it rhymed

@MAFIA36790 Doubtful.

@SirCumference It's not an original saying.

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