The h Bar

user116211

3:00 PM

Me involved neither; I've not flagged anyone as far as time goes since my coming here @0celo7.

John Duffield

I'm in the clear then.

0celo7

@ACuriousMind A mod came in and say "oh, the flag was dismissed" after I was suspended.

For saying BS, by the way.

user116211

@0celo7 Yeh, saw that.

0celo7

10k users are full of trolls who validate each and every flag they come across.

David Z

@0celo7 that's rather unnecessary phrasing

0celo7

3:01 PM

@DavidZ No, it's not.

I'm tired of the flag validation troll band

ACuriousMind

@0celo7 I'm not sure whether mods can see what the outcome of a flag was, but 10k users never get to know what ultimately happened to a flag they voted on unless they go looking for it.

John Rennie

@DavidZ Actually I agree with 0celo7 on this one.

John Duffield

Anyway, who wants to talk physics?

David Z

Well then perhaps you'd prefer I be more direct: it's inappropriate phrasing. Don't suggest that people are idiots.

0celo7

@ACuriousMind Doesn't matter. People definitely validate every flag.

It's like putting goop on stairs. You don't know who gets screwed over, but someone will.

John Rennie

3:02 PM

I would guess some 10k user(s) didn't bother to read the comment properly and just clicked the Valid button.

0celo7

@ACuriousMind I read this wrong.

He did go looking for it, because he came here.

So I don't know why he said it was dismissed.

@DavidZ It's not inappropriate because it's not directed at anyone specifically.

I am saying someone who validated that is an idiot.

ACuriousMind

Given the number of 10k users on the network, I think this isn't a particular group of people nor "people". I agree however that it seems kind of random whether offensive flags get validated or not - probably precisely because it's prety random who votes on them.

John Duffield

@0celo7 : oh FFS, get over it.

0celo7

I'm not pointing my finger at anyone.

@JohnDuffield Be quiet.

John Duffield

Move on. Instead of whining.

0celo7

3:04 PM

@ACuriousMind Who even flags in the first place?

John Duffield

Physics anybody?

0celo7

If you knew any physics, sure.

David Z

@0celo7 and I'm saying don't do that. Consider this a formal warning if that's what it takes.

0celo7

But no one here is interested in another long, drawn-out discussion with you.

ACuriousMind

@0celo7 Impossible to know by design. Which wouldn't be a problem if the flag outcomes were consistent.

0celo7

3:06 PM

@ACuriousMind I thought mods could see flags.

David Z

We can see chat flags while they're active, but I don't think we can see who cast them.

0celo7

@DavidZ Meh. You ban me or they ban me. Doesn't really matter any more.

ACuriousMind

@0celo7 I think in most cases the 10k users act on flags before any mod actually gets up to investigate. The chat flag system is broken, and it has been forever, there are four years old meta.SE posts about this very issue.

John Duffield

I actually bought a New Scientist this week.

John Rennie

@0celo7 calm down, it was just a couple of people who didnt read the context before validating.

John Duffield

3:08 PM

John Rennie

"cockup" not "conspiracy"

0celo7

@JohnRennie No conspiracy, just a bunch of... ::looks at David:: ...wonderful people.

John Rennie

@0celo7 :-)))))

0celo7

Might want to get that quadruple chin looked at.

@JohnRennie How's Women on Sex?

John Rennie

The quadruple chin has been hard earned!

David Z

3:11 PM

sigh lol

0celo7

Every time I have good pork chops I have to rethink my position on beef as the king of meats.

John Rennie

Those rolls contained bacon and cheese!

0celo7

They can rival the legendary New York Strip, and are about half as expensive!

Which, given my rabid book buying habits, is pretty important.

John Duffield

It doesn't start well. The first three of the six principles are 1) the speed of light is constant 2) the equivalence principle, and 3) the cosmological principle. Only 1) it isn't, 2) it only applies to a region of infinitesimal extent, and 3) is like saying I live in a forest so everybody else does.

0celo7

@JohnDuffield But we have telescopes to check 3), and 1) and 2) are the usual dead-end conversations.

John Rennie

3:14 PM

@0celo7 I got it free as an introductory offer in a book club. It's written by a masters student who did a mini Kinsey type study for her masters then turned the results into a book. Fun reading, and quite eye opening in places.

ACuriousMind

...what kind of book club was that?

0celo7

@ACuriousMind Desperate single women.

@JohnRennie I'm currently eyeing about 9 books. Realistically, I will "use" all of them, but not completely read any.

John Duffield

@0celo7 : when it comes to 3) we can't see the wood for the trees, and 1) and 2) are the usual popscience myths.

0celo7

I wish I could return BBS as "defective"

John Rennie

@ACuriousMind just a normal one - I think it was connected with one the UK daily papers. The book is rather less controversial than the title suggests.

ACuriousMind

3:17 PM

@0celo7 "Doesn't work as advertised"?

0celo7

@ACuriousMind Yes, something like that :D

@JohnRennie Do you own a single math book?

I would show my library but I don't want you to know how much of a hoarder I am...or to tell me I could have bought a high-end gaming PC instead.

ACuriousMind

You could've bought a high-end gaming PC instead.

John Rennie

Not in paper form. I've quite a lot of popular maths books as ebooks and one or two proper maths textbooks that I'm still hoping to read one day ..

0celo7

Because that thought never crosses my mind!

@JohnRennie Oh, what books?

I can recommend some good ones (really good, not meme good)

ACuriousMind

wtf does "meme good" mean?

0celo7

3:20 PM

@ACuriousMind I don't know algebra well enough to say it in terms that you understand

John Rennie

The best popular maths book I've read is (by a long way):

amazon.co.uk/…

0celo7

but in geometry, we have Kobayashi-Nomizu

fantastic books because they somehow contain all of geometry, but impossible to read

@JohnRennie I meant the proper textbooks?

At least one Riemannian geometry book I hope?

@ACuriousMind Really, it's reference books that are "meme good"

but stuff like Sachs and Wu is meme good

John Rennie

@0celo7 No, fraid not.

0celo7

like people say it's good, but it's actually terrible

@ACuriousMind does that make sense?

ACuriousMind

Yes

John Rennie

3:23 PM

I bought a couple of books on number theory because it seemed a good idea at the time, but I've never read them.

0celo7

people only say it's good because they can find answers in it, sometimes

Steenrod is meme good. Algebraic topologists on the math chat say it's incredibly hard to read, by my advisor loves it for some reason

John Rennie

Actually I do own this in real book form. Does this count?

amazon.co.uk/Geometrical-Methods-Mathematical-Physics-Bernard/…

0celo7

Why does the $V$ have a bar?

@ACuriousMind Ah. HE is meme good.

It's actually a terrible book.

Completely unreadable for non-experts.

@JohnRennie Maybe, but I'm weary of a book covering so much material in 200 pages.

amazon.com/Geometry-Manifolds-AMS-Chelsea-Publishing/dp/…

I don't know if I need this

It seems fairly standard, but for some reason my advisor bought it

0celo7

3:45 PM

Is tinnitus a standard term?

ACuriousMind

For a high-pitched noise you hear but which has no external cause?

0celo7

Yes.

ACuriousMind

Yeah, I would call that a standard term

0celo7

@ACuriousMind For the record, I know what it means.

I am surprised someone else doesn't.

@ACuriousMind Oh, I forgot! There were no clowns.

John Rennie

@0celo7 Maximus Tinnitus - a 2nd century Roman emperor.

Known for his high pitched whining voice. They named the disease after him.

ACuriousMind

3:53 PM

lol, nice faux-etymology

John Rennie

It's true!

(for a small and unconventional subset of meanings of the word true)

0celo7

I don't want to buy more books...but I must.

Help me

Honestly the best argument is that my "immediately accessible" shelf is full.

Like...really full.

It's spilled onto the desk proper

user218912

4:32 PM

hello

0celo7

4:44 PM

what's up?

user218912

I'm rewriting my qft problem set in larger font so it's readable. I'm surprised I was able to finish it at all, thanks to you guys. :)

user218912

and I'm also despairing over problem set 2 which is apparently really difficult if I remember from last year.

user218912

@0celo7

user218912

Oct 5 '15 at 12:41, by 0celo7

@ACuriousMind here is the problem statement https://i.gyazo.com/ba440d94c6af69a5818c4642e16c6c51.png

user218912

what do.

0celo7

4:47 PM

Maybe I should buy a shelf instead of more books

user218912

are you allowed bringing your own furniture in residence?

0celo7

yes

user218912

lucky.

user218912

@0celo7 ...so if I want to learn how to do that problem what should I do?

0celo7

Considering your problems, I think you're unlucky :/

user218912

4:49 PM

@0celo7 which problems? my personal issues or my problem sets?

0celo7

@IceLord Residence hall problems.

Internet, furniture

user218912

right.

user218912

i'm at home right now though, i go home on the weekends.

0celo7

I have two shelves, and a nice desk chair

user218912

if I was in residence it would take 3 mins to reply to your messages.

0celo7

4:50 PM

it's actually quite nice here

user218912

@0celo7 I have a desk with a shelf on top of it.

user218912

do you still have that loud LoL roommate?

0celo7

@IceLord I mean I brought in two shelving units

@IceLord No

user218912

that's good XD

0celo7

@IceLord uh

let's see

You might have reached my QFT limit

I know how to do the contour thing

Yeah, I dunno how to do that.

user218912

4:53 PM

maybe i'll have an idea once we learn time ordered product in class in a week or so.

0celo7

Should I?

user218912

for what?

0celo7

Some books

Not Lee hardback

user218912

sure.

user218912

I bought some books yesterday.

user218912

4:55 PM

with my infinite source of money a.k.a. student credit card.

0celo7

they give you money for books?

user218912

no I'm kidding.

0celo7

I have an infinite source of money aka my job :)

user218912

dude reminds me

user218912

this prof told me if I get at least a 70 in 3 graduate courses this year he'll get me a research grant with him for the summer.

user218912

4:56 PM

5k for the whole summer.

0celo7

cool

user218912

that would be my first job.

user218912

but... can I do that?

user218912

I'll need to work like 17 hours a day to get a 70 in 3 courses.

0celo7

I know $70 of that is mine in the form of Lee.

user218912

4:57 PM

I'll try my best xD

0celo7

I'll give my paperback Lee to my advisor.

user218912

@0celo7 sure dude if I succeed in this idc I'll buy you lee and a few other books.

user218912

100%

user218912

quote me on that in april.

0celo7

@IceLord First edition HE.

Unused.

user218912

4:59 PM

:O

0celo7

Wonder how much that actually is

I remember it being like $400

abebooks.com/servlet/…

$450 lol

I don't actually want that.

user218912

good.

0celo7

Well, I do, but maybe when I'm retired or something.

But then it'll be $1500.

Hmm.

@IceLord what have they told you about the time ordering operator

user218912

@0celo7 nothing

user218912

we just learned about quantizing classical field theory.

user218912

5:06 PM

we didn't even learn normal order yet.

0celo7

then how are you supposed to do that problem?

user218912

it's due october 15.

user218912

and I realized that the prof goes wayyy more into detail in class than in the notes so

user218912

i pretty much am depending on my own class notes for reference.

0celo7

that's generally how going to class works...

user218912

5:09 PM

lol

user218912

I don't find that's true for all classes though.

user218912

in my condensed matter class the prof basically just states results and says to look in the book for more details.

user218912

._.

user218912

we're finally going into some cool stuff this week, we were spending the last few weeks on drude model.

user218912

@0celo7 my condensed matter course assigns all the problems from the book and it has a solutions manual online.

user218912

5:17 PM

what would you do in that case?

0celo7

cheat, probably fail the final, not get the 5k

user218912

xD

user218912

@Obliv hey.

Obliv

hello @icelord

0celo7

wtf no hi for me, what am I chopped liver?

ACuriousMind

5:22 PM

Mmmmmmh, chopped liver

user218912

lol

0celo7

@ACuriousMind What are your thoughts on my current avatar?

Obliv

@0celo7 do you ever take a day off

ACuriousMind

I'm not sure what it is, but it looks kinda cool

0celo7

@Obliv No, currently struggling with PhD level homework

combinatorics

I recently got an enthusiast badge

it's been a while since I got one of those

ACuriousMind

5:25 PM

Well, you get them only once per site

0celo7

really?

ACuriousMind

Yes

0celo7

I can't believe I've only gotten one

ACuriousMind

Otherwise I should have multiple Fanatic badges :P

0celo7

I have the pundit badge

wonder what comments I left that were good

I mostly leave snarky ones that get deleted

user218912

5:27 PM

@ACuriousMind what do you think of the qm book by schwabl?

0celo7

NO

@ACuriousMind let me answer

@IceLord ACM does not know how to read. He knows ZERO books.

user218912

@0celo7 he knows schwabl.

ACuriousMind

@0celo7 Both statements are untrue but capture the essence :P

0celo7

I'm calling shenanigans

Is that a yiddish word?

ACuriousMind

I have occasionally looked at Schwabl to look something up, but I don't have an opinion about it.

user218912

5:29 PM

@ACuriousMind YES if acm read schwabl then it must be good.

user218912

it will be my go to reference.

ACuriousMind

wat

I looked at it because I was a QM book I could get for free

No judgement involved

0celo7

@IceLord ACM owns BBS string theory. It must be amazing.

user218912

from all the string theory books I've looked at, I could actually understand BBS chapter 1-2 I think.

user218912

so I agree.

0celo7

5:33 PM

@ACuriousMind :]

ACuriousMind

::facepalm::

0celo7

@ACuriousMind I'm god-awful at combinatorics. It doesn't make sense

Can you help?

ACuriousMind

Depends what exactly you mean by "combinatorics"

0celo7

Draw 13 cards, that type of shit

Physics Meta

0

Q: Can I ask to have a block or left alone by a user?

I have this user who is always the first to close and down vote most if not all my work if you can call it that. I do not want him on my stuff. I truly feel harassed even though he has not really broke any rules. I just want him to leave me and my stuff alone forever! What can I do?

0celo7

5:34 PM

high school math, honestly

LOL

ACM stop bullying Jen

ACuriousMind

Sigh.

This is why people often don't bother to leave comment when they downvote.

4

0celo7

@ACuriousMind Drawing 13 cards from a standard deck. $A$ is the event of drawing 4 aces, $B$ the event of drawing 4 kings, I have to find $P(A\cup B)$.

user218912

bleh

0celo7

I don't even know how to begin

user218912

I don't remember how that works either.

user218912

5:37 PM

I took a course like that in hs.

ACuriousMind

Oh, I hate those exercises, too

0celo7

The hint is to use Bayes' thm

oh shit I have a violin thing to go to...

user218912

oh you play violin?

0celo7

no

user218912

I think I know what you're referring to.

user218912

5:39 PM

have fun.

0celo7

what?

user218912

sorry I phrased that badly.

user218912

brb

John Rennie

I agree, he is a big meanie. He downvotes like 80% of the time. — 0celo7 8 mins ago

2

That made me chuckle for several minutes :-)

0celo7

@IceLord there is a violin concert that someone wants me to go to

ACuriousMind

5:46 PM

the clowns are forcing you to go hear violins? Oh, the horror!

0celo7

@ACuriousMind This might be the best avatar yet. Album cover from Travis Scott's latest LP.

@ACuriousMind I don't think the person would appreciate the comparuson

ACuriousMind

I believe she wouldn't, yes

0celo7

@ACuriousMind So, any clue how I do that problem?

The homework is often very disjoint from the lectures

Fermi paradox

6:45 PM

@dmckee (regarding cyborgs) Exoskeletons seem very promising. :)

HDE 226868

6:59 PM

@ACuriousMind You wouldn't consider a user-requested voting ban on you site-enhancement? :-)

dmckee

@Fermiparadox Yeah. Even quite light and wimpy ones could make a huge difference for geriatric patients. And they are investigating single purpose one to help health-care works lift patients which is especially interesting because it provides an environment for development of the technology on a commercial basis.

ACuriousMind

@HDE226868 I'm sure some would.

user218912

7:19 PM

@BernardMeurer I need python help.

user218912

or i'm fucked.

HDE 226868

7:30 PM

@IceLord There's an outside chance I can help. What's the issue?

Bernard Meurer

@IceLord I'm home now

What's up?

0celo7

8:00 PM

@BernardMeurer listened to some cultured music today

Chopin, some others

Bernard Meurer

@0celo7 Chopin is nice

@JohnRennie Got bumblebee to work :)

Had to do a full reset of Linux though

but that only takes me 40 minutes nowadays

0celo7

I also was inspired to buy some books in the intermission. I have issues.

Bernard Meurer

@JohnRennie Intel GPU -> i.imgur.com/UBObaoY.png

@JohnRennie Nvidia GPU -> i.imgur.com/zHkoIt8.png

DanielSank

Hi, everybody.

0celo7

hi

@DanielSank I desperately need help in intro probability

Bernard Meurer

8:06 PM

@DanielSank Heya

I'll soon explain to you what my great idea was

Now that my video drivers work :)

And my backlight control

DanielSank

Ok, my inbox is always open

@0celo7 Ask on math.se and send me a link?

0celo7

@DanielSank It's a one-line question

the lectures are completely disjoint from the homework, and I cannot understand the lecturer half the time

he has a really thick Indian accent, makes a lot of mistakes, etc.

Drawing 13 cards from a standard deck. $A$ is the event of drawing 4 aces, $B$ the event of drawing 4 kings, I have to find $P(A\cup B)$.

I don't understand what concepts to use

I'm worried about failing the class because I literally have no clue what's going on

I'm thinking I should write $P(A\cup B)=P(A)+P(B)-P(A\cap B)$

But what is $P(A)$? Is it ${52\choose 4}/{52\choose 13}$?

And the same for $P(B)$?

Then $P(A\cap B)={52\choose 8}/{52\choose 13}$?

@BernardMeurer Do you know?

Bernard Meurer

@0celo7 Hmm let me think

0celo7

That gives me a negative probability.

Bernard Meurer

52 cards in a deck, 4 of each card

the probability of getting any ace is $\frac{1}{52}$ right?

0celo7

8:19 PM

there are 52 cards

Bernard Meurer

typo

0celo7

but it's getting an ace in a 13 card hand

you need to use combinatorics

Bernard Meurer

so getting 4 aces will be $$\frac{1}{52}\times\frac{1}{51}\times\frac{1}{50}\times\frac{1}{49}$$

0celo7

again with the 54 :P

Bernard Meurer

There :p

0celo7

8:21 PM

but that's not right, because you could draw 9 other cards first, then get 4 aces

you need to use binomial coefficients

Bernard Meurer

Ah

Yeah I don't know that :/

0celo7

I'm clearly doing something wrong

let's read the book again

ok, what I need is the number of ways of drawing a hand and having 4 aces in it

Aha, maybe we have to look at the cards that are not aces

So we need the number of non-ace hands.

So if we have 4 aces, then the rest of the $9$ cards are chosen from $48$

so that's $48\choose 9$ hands.

user218912

@BernardMeurer @HDE226868 I have to use pylab to plot some stuff and also do numerical integration.

user218912

no idea how.

0celo7

0.00528 is the answer

seems legit.

user218912

8:30 PM

@0celo7 what course is this for?

0celo7

Axiomatic probability

user218912

wow you really do want to become a true mathematician.

Bernard Meurer

@IceLord jakevdp.github.io/mpl_tutorial/tutorial_pages/tut1.html

This might help. I've never messed with Pylab

user218912

@BernardMeurer i'll read it thanks.

Bernard Meurer

No worries man

user218912

8:32 PM

it's due friday so i'll do it friday at 3am.

0celo7

$$P(A\cup B)=2\cdot \frac{48\choose 9}{52\choose 13}-\frac{44\choose 5}{52\choose 13}=0.00528$$

Dammit

HDE 226868

@IceLord There should be some numerical stuff already loaded via scipy.integrate(), if you can get that. Or you could always write an RK4 routine (or other numerical method), if you want more of a challenge.

0celo7

Why does it work here but not in my thingie

Bernard Meurer

31 mins ago, by Bernard Meurer

but that only takes me 40 minutes nowadays

Why did someone star this?

HDE 226868

Also, for a plotting introduction: matplotlib.org/users/pyplot_tutorial.html, if you want matplotlib.

0celo7

8:33 PM

@BernardMeurer Made me laugh for 25 minutes.

user218912