The h Bar

This list is extensive, but not exhaustive. I am aware that there are more standard GR books out there such as Hartle and Schutz, but I don’t think these are worth mentioning. Books with stars are, in my opinion, “must have” books. (I) denotes introductory, (IA) denotes advanced introductory, i.e...

Sir Cumference

Sigh...

How about QM and QFT? Could I learn both of those in college?

0celo7

@SirCumference You can

But I won't take the GR course here because it's physics

Not really what I'm interested in

@SirCumference not QFT

I'm taking a QM class as a sophomore

Sir Cumference

@HDE226868 Isn't it the other way around?

0celo7

12:35 AM

But I know more math than you

And more physics

And I already know QM

Sir Cumference

True, ya do

Considering I had a horrible high school physics teacher who barely remembered the material herself, I'd agree

0celo7

Don't put your failure on the teacher

Sir Cumference

I wouldn't say I'm a failure

HDE 226868

@SirCumference No, because the things I'm learning require virtually none of the material I started learning when exploring general relativity. I choose to forget some things I don't need to know and likely won't go back to for a while in order to learn things I'll need to know immediately.

Sir Cumference

I got all As in that class, but I hated the way she taught it. She took all the interesting things and made them horrendous.

Teachers have an impact on their students

Especially ones that don't remember or care about being there

@HDE226868 Ah.

Fun fact, I found out a few weeks ago I was supposed to be in calc a year ago. But that teacher left so they retaught me trig, for two years.

0celo7

12:39 AM

And your excuse for not teaching yourself calc?

Sir Cumference

My school is messed up.

Eh, ACT, college classes, etc.

If anything I spend my free time reading astronomy

Calc 1 is a whole year's worth of information

0celo7

Calc 1 is one semester.

Sir Cumference

Is that not the same as Calc AB?

HDE 226868

Honestly, I would put the astronomy reading on hold to learn Calc 1, if I had been in your situation. The subject opens up doors aplenty. The single worst part about learning a subject you may not be 100% prepared for is coming up against a derivation you can't follow because you don't have the full mathematical background.

Sir Cumference

@HDE226868 I know single-variable differentiation and integration. That's about it

And it's been useful

If anything, I can follow along with some cosmology

HDE 226868

12:42 AM

That sounds like Calc 1.

Sir Cumference

@HDE226868 I assume there's more than just that?

0celo7

@HDE226868 Sounds like Calc 1 and 2 to me.

Sir Cumference

The textbook I first started looking at taught integration before differentiation

HDE 226868

@SirCumference Sort of. In Calc 2, you explore more of the applications - power series, parametrics, etc.

@0celo7 My memory is foggy on that.

Sir Cumference

Hm, k.

@HDE226868 What are ya taking now?

0celo7

12:44 AM

@SirCumference That's the natural way of doing it in analysis.

You need topology to do differentiation but not integration.

Sir Cumference

@0celo7 So...it's good that I learned int before dif?

0celo7

@SirCumference No, it's irrelevant in calculus.

HDE 226868

@SirCumference First semester was Calculus III; second semester is an introduction to linear algebra/linear programming.

Sir Cumference

@HDE226868 High school? Jesus.

I'm pretty behind I guess.

Which sucks.

HDE 226868

@SirCumference Protip: I am in way a good standard for normalcy. I'm not aware of another high school that offers it.

Sir Cumference

12:47 AM

If anything, I'll learn them in college. I'd been to busy focusing on ACT and grades, but it's paid off.

0celo7

@HDE226868 *no way

@SirCumference I didn't go beyond calculus 2 in high school.

Sir Cumference

Speaking of which, how'd ya guys do on that damned thing?

?

ACT/SAT

Not good

12:50 AM

:/

Which section tripped ya up? For me it was the writing

0celo7

All of them

HDE 226868

@SirCumference I never took the ACT. I got two 2270s on the SAT; superscore was a 2330. I never got a perfect score in math; my best was a frustrating 790.

Sir Cumference

Er, what's that in terms of ACT?

0celo7

Way higher than mine

Sir Cumference

Oh jeez, that'd be a 35

I got a 34 :/

0celo7

12:53 AM

Higher than mine

Sir Cumference

First time, luckily

@HDE226868 "Frustrating 790"?

I got a 35/36 on Math but I ain't complaining

@0celo7 Ya ended up studying megacomplex things tho...

Even tho I'm a year younger than ya, I'm still way behind academically...

That's aggravating as hell

0celo7

@SirCumference I'm not very smart.

HDE 226868

@SirCumference A lot of kids at my school hit 800.

0celo7

Just motivated.

Sir Cumference

@HDE226868 Jesus Christ, what kind of school did you go to?

The average in my school was a 22...

HDE 226868

12:56 AM

@SirCumference A magnet school.

Sir Cumference

Oh dang

Wait, 0celo said you were in Canada?

0celo7

Yes

Sir Cumference

Yet you took the SAT?

0celo7

I think Canadians take the SAT

HDE 226868

@SirCumference 0celo7 often lies about my country. I am indeed an American.

Sir Cumference

12:58 AM

Oh what state?

0celo7

@HDE226868 Take that back

I do not lie

HDE 226868

@0celo7 Edited. Happy?

Sir Cumference

@0celo7 That is a lie in itself

HDE 226868

@SirCumference I cannot reveal that information, as it would compromise our agents in the field. Save that it is in the Northeast.

Sir Cumference

You lie from questions about physics to your own major

@HDE226868 Er, how?

0celo7

12:59 AM

@HDE226868 Pennsylvania?

Sir Cumference

I'm NY here

HDE 226868

@SirCumference That's a Calvin and Hobbes reference.

Sir Cumference

K good because I understood none of that

HDE 226868

@0celo7 In two months.

Sir Cumference

Ya guys had to take regents?

0celo7

1:01 AM

What?

Sir Cumference

Oh wait. Those are only in NY.

HDE 226868

@SirCumference What?

Sir Cumference

Public school test.

0celo7

@HDE226868 I already said that.

HDE 226868

@0celo7 I know.

@SirCumference Is that like PARCC?

Sir Cumference

1:02 AM

@HDE226868 What?

0celo7

@HDE226868 You mean like the SOLs

HDE 226868

@SirCumference Welcome to a nationwide debacle.

Sir Cumference

Here's the [en.wikipedia.org/wiki/Regents_Examinations regents]

Crud, apparently I don't know how to link

Anyway, there's one in almost every high school subject. Ya need to pass a certain amount to graduate.

0celo7

@HDE226868 Delaware

HDE 226868

@0celo7 No.

Sir Cumference

1:07 AM

@HDE226868 DC

0celo7

@HDE226868 You're probably lying

@SirCumference >Northeast

HDE 226868

@SirCumference Does that count as Northeast?

Sir Cumference

Oh yeah

0celo7

DC is the south you dummie

HDE 226868

@0celo7 Why do you say that?

0celo7

1:07 AM

@HDE226868 You have agents to protect

Sir Cumference

So what foreign language did y'all take?

@0celo7 What?

Español aquí

Latin

@SirCumference Latin in middle school, Spanish in high school because I had no choice.

Sir Cumference

1:08 AM

A dead language?

I also had to kind of learn Hebrew in middle school (Jewish school), but yeah, Spanish was the only thing they had in high school

0celo7

I don't need to speak anything but English

I have no use for people who can't speak it

Sir Cumference

I speaks Engrish too.

HDE 226868

@0celo7 No estoy acuerdo.

Sir Cumference

@HDE226868 ¿Por qué no?

0celo7

@HDE226868 My response to that would get me banned.

Sir Cumference

1:11 AM

@0celo7 Este idioma es secreto para nosotros

Oh, btw

HDE 226868

@SirCumference Porque estan muchos experimentos de la astrofisico en otros paises.

Sir Cumference

@HDE226868 Ok.

HDE 226868

@SirCumference Cual sitio de Stack Exchange?

Sir Cumference

@HDE226868 Pienso que estaba del Space Exploration

HDE 226868

Estaba?

Sir Cumference

1:13 AM

¿No? No sería "estuvo"

HDE 226868

Hm. No puedo encontrar.

Sir Cumference

Raro.

HDE 226868

@SirCumference I was emphasizing the past use of estar, as opposed to the present tense.

I.e. it seemed to imply that the question no longer existed, which may be the case.

0celo7

Build the wall!

Sir Cumference

Oh. Well yeah, at least I think it was from the SE site

Hoffmanfan sent it to me

Almost as good as this

Sometimes we all need a laugh

HDE 226868

1:16 AM

> "Gibberish as it stands." – Sir Cumference Jan 31 at 19:06

Sir Cumference

@HDE226868 IK. But I can't see the deleted answer 'cause I'm not a mod.

HDE 226868

@SirCumference I think you just need to reach 2k, on a beta site.

Sir Cumference

Yep. 200 rep away. But I don't ever have the time to work on it.

0celo7

Link?

HDE 226868

Tu necesitas 187 puntos.

7

Q: At what size do objects burn up in the atmosphere when falling from orbit?

As the title suggests, I am wondering the maximum size an object can be so that it will completely burn up when entering and falling through Earth's atmosphere. I'm focusing on man made objects, not asteroids or meteors. Also, how much does the make-up of the object affect its burn rate? I.e. met...

Sir Cumference

1:17 AM

@HDE226868 Ya lo sé. Pero no puedo porque tengo mucho trabajo

Most of my points actually came from that Sun-loudness answer

HDE 226868

@SirCumference Ah, si. Yo termine el mayoria de mis proyectos finales, y tengo dos examenes finales.

@SirCumference No kidding.

Sir Cumference

@HDE226868 Yo también. Alguien máteme...

0celo7

A Mexican Jew, who would have thought

Sir Cumference

@HDE226868 Also, that paper reminds me of this.

kurims.kyoto-u.ac.jp/~motizuki/…

@0celo7 >_>

Half-Egyptian, actually

Still bizarre in itself

HDE 226868

@SirCumference You lost me at "semi-graphs of anabelioids".

Sir Cumference

1:22 AM

@HDE226868 I got no clue what it's saying either.

Again, Hohmannfan sent me that, but he has no idea what it means

0celo said it was a meme

On a side note, I might as well show Google's intelligence.

0celo7

Holy shit it's 9:30

I have got to finish this chapter in Milnor and do some exercises

Sir Cumference

@0celo7 All right, 'night

0celo7

I'm not leaving

Sir Cumference

Ok nvm

0celo7

I just need to stop farting around on YouTube

Also I need to put on a second sock or take off the remaining one.

Sir Cumference

1:26 AM

@0celo7 What will 0celo7 do? Find out on the next episode of 0celo7Z

Okay childhood joke

Probably no one will get...

0celo7

OH GOD

IT WORKED

Sir Cumference

JESUS

What is that

0celo7

Lol

It's my notes from my diff topology course so far

Sir Cumference

Er, I thought you'd have written notes on pen and paper

0celo7

@SirCumference It's a reading course

Sir Cumference

1:29 AM

Uh, microsoft word?

0celo7

LaTeX

Sir Cumference

Ooooooooo⁰⁰⁰⁰⁰h

0celo7

@SirCumference Currently deriving the hairy ball theorem a second time

thanks whoever deleted that

Sir Cumference

Oh yeah. I tried explaining that to all my friends. They just kept snickering at the name...

One even looked up "Hairy balls" on Wikipedia and it redirected them to the theorem

0celo7

Well you probably don't know how to prove it

Sir Cumference

1:32 AM

You'd be right

But I'm reading up on the hairy donut theorem

Maybe I'll figure it out

0celo7

Dunno

It's 24 pages into Milnor's diff topology book

Sir Cumference

.-.

0celo7

Which requires some real analysis and topology

Sir Cumference

I'll stick to learning calc 1 then...

But I did learn a tad bit of analysis/set theory, it was pretty amazing

0celo7

oh?

Sir Cumference

1:35 AM

Ordinals, cardinals, aleph-null and other infinites

0celo7

Dunno what that is, seems boring

Sir Cumference

It puts a new meaning to "infinity"

0celo7

oh I'm sure

Sir Cumference

Having numbers after the set of all real numbers

Then having numbers after that set

0celo7

Why do I need such numbers?

Sir Cumference

1:36 AM

Then having a number after the set of every possible number set

What, are you interested in applied physics?

I'm justing learning it because it's interesting, not that I'll use it

That's kind of the reason I wanna learn GR too

Even tho I'd be on a premed track

vzn

1:49 AM

@Obliv hi there is some recent flash/ resurgence of interest in bohmian mechanics but JR is accurate in pointing out its basically a minority pov/ area. see eg vzn1.wordpress.com/category/physics

@Obliv drop by Computer Science & will walk you thru it (not all at once)