The h Bar

dmckee

00:42

@Obliv You appear to just be asking about the procedure for plugging numbers into a problem. I don't think you can render that on-topic.

dmckee

01:21

On the other hand, you might be able to frame a question about interpreting the individual contributions.

DanielSank

02:00

@0celo7 One of my coworkers asked me if he could link my Physics.SE profile in our performance review as evidence that I know stuff.

skill patrol

@DanielSank This user has been temporarily suspended by a moderator and cannot chat for 20 hours 36 minutes

And that's not an April fools joke :(

vzn

02:42

@DanielSank quite a few ppl use SE profiles wrt developer interviews. there seems to be an SE program for that (job placement services).

DanielSank

@skillpatrol Pfft. What did he do this time?

vzn

@hubot what parts of unity are you using/ playing with? (the engine has quite a bit of physics built in...)

FenderLesPaul

02:58

@BernardMeurer what?

wait so what are you going to do?

user116211

@FenderLesPaul: o/

skill patrol

@DanielSank he was just being himself...

5 hours ago, by 0celo7

WOO WOO

dmckee

04:06

Hmmm ... by level 12 you're looking at a serious rain of fiery unicorn downvote vengeance.

There is a little good news: the more time it spends dropping that stuff, the slower it actually progresses across the screen.

Sad. I died on level 16.

Bernard Meurer

04:50

@FenderLesPaul Start working I guess

skill patrol

05:12

6 hours ago, by skill patrol

Don't drop out.

Unless, of course, you're an extraordinarily gifted independent studier :-)

skill patrol

05:38

@dmckee If you wanna ride don't ride the white horse

:P

Danu

@ChrisWhite I think it's a pretty boring game :P

Secret

08:58

https://www.youtube.com/watch?v=n_6p-1J551Y
Imagine put panals on it and paint it black, then place it in the streets

https://www.youtube.com/watch?v=wdgzU_84VMg
I wonder how this magnetic field can be calculated to explain why the metal sphere rotate on its side

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

Have you ever taken a course with wildberger?

If not, would you want to?

Secret

Depends, I don't know really well about his teaching style, thus I cannot really say whether I like or don't like it

But on thing is clear, I do have a history to be able to get my answers from many teaching styles thus I am generally not worried

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

09:21

I'm not questioning your abilities, I'm just wondering if you're interested in his approach?

Enough to take his course(s).

Secret

Consider the fact that I found his rational trigonometry is useful and possibly insightful when most people said it is redundant, I don't think I will possibly have issues with

I do receive reports that he did his lecture using youtube videos and that some of them don't find it useful, but I will always clarify anything unclear with professors,thus that is also not likely to be an issue

He is a finitist, as many said. There's nothing that said the world is 100% not infinite. nor it is said that a word made of finite quantities does nt work. The fact that the 2 philosophies are not being r…

Secret

anyway, are you planning or have already taken his course, cause I am quite intrigued by you raising this topic out in the blue?

Secret

PS I personally like the crazy rules of infinities, but that does not mean I will oppose any view that is against them

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

09:38

Nah, I was just wondering because of your proximity :-)

Secret

Last time I saw him is when a friend of mine need to ask him help on some questions. After that I am too busy on my honours research that I rarely entered the maths building now

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

He certainly has done a lot of work on youtube.

From middle school math up through grad school topics.

I didn't know that his linear algebra was not good, thanks for the info.

Secret

Those guys are arguing that because of his finitist background, the linear algebra context is incompatible with the background, as linear algebra (however finite dimensional it is for 2nd years) does involve quite a bit of infinities in terms of convergence, suppreumum and infimum

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

Right.

John Rennie

10:56

@Secret how do you post long texts like yours? Is there a sneaky trick to get round the length limit when typing posts?

@AccidentalFourierTransform: you've obviously guessed it

use ${}{}{}{}{}$ padded out to the required length :-)

AccidentalFourierTransform

@JohnRennie yep, very clever (actually I didnt guessed it, I saw it when I refreshed the page)

John Rennie

I didn't want to say that in the main site since I shouldn't be encouraging people to break the rules :-)

It wouldn't hurt if you sdeleted your comment asking how it was done.

Secret

Because my text are long paragraphs, in order to not strain the eyes of my readers (and to let the to be able to understand), I linebreak my paragraphs

however (as Acuriousmind have identified a year ago) this end up with the side effect of te text being treated as copy/paste text and thus the limit does not apply

I must stress I never knew the limit exist until pointed out by acuriousmind

ACuriousMind

@JohnRennie Press Shift-Enter to insert a line break. Normal rules don't apply to chat messages with linebreaks.

AccidentalFourierTransform

@JohnRennie I promise I'll try my best not to use it ;-) (but sometimes "No" is all I can think of...)

ACuriousMind

11:08

That also breaks markdown, btw.

John Rennie

Aaahhhh - shift enter, thanks :-)

@AccidentalFourierTransform I only comment with "No" when I really mean "No and don't be stupid" :-)

Secret

NB Shift-enter does not work in main site comments, the way I get pass that is to use 4 doller signs

ACuriousMind

@JohnRennie Using something like   for padding is better, as that doesn't require the MathJax renderer.

John Rennie

I hope there are no mods watching this discussion of how to get around the site rules. We'll all end up in the sin bin along with 0celo7 and Sleareh :-)

Secret

I honestly have a presentation problem when it is doen in written form. Just today, my postgrad teamates said they have no idea what I am saying and that I say something that I don't understand, and I don't even realise I don't understand until they pointed out

John Rennie

11:11

@ACuriousMind aha, good point, it had never occurred to me to do that.

Secret

The exact same thing is pointed out many times in my physics discussion with acuriousmind and slereah

I am starting to wonder why I have no problem makign peopel understand in non written form, but fail to do so in written (including typing) form

John Rennie

Here's a first line

Then a second line, and ...

... it works!

Secret

My group also noticed I somehow unawarely overcomplicated explanations whenever I present them in written format, and I don't know why

Since this phenomenon also happen in this chat between me an others, perhaps I might find a partial answer here?

ACuriousMind

I don't know what exactly you're doing, but your explanations often end up doing things with mathematical objects that you simply cannot do with them, or that don't have the meaning you seem to think they have.

John Rennie

@ACuriousMind I've just tried putting   into a comment and it rendered as " "

ACuriousMind

11:36

@JohnRennie Hm, that's strange, it definitely works in answers. Perhaps that's deactivated in comments for exactly that reason.

ArtOfCode

Paste the character literal and it'll work

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

11:51

Hi @ArtOfCode :-)

ArtOfCode

morning

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

Is that the sun rising or setting in your new avatar?

ArtOfCode

Setting, I think.

ACuriousMind

Every observer will see the sun setting or rising depending on their preoccupations.

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

Strangely enough, I've heard a roster crow at sun set :P

*rooster

Mobile has no edit :(

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

12:13

@ACuriousMind would that rooster count as a valid "observer" since it crowed at both sunrise and sunset? :D

John Duffield

12:32

@DavidZ : re "remember, we told you not to have those kinds of discussions here", I gave some brief comments in response to some not-nice things said about me, and clarified barry's "my theory" misunderstanding. That doesn't constitute a physics discussion.

ArtOfCode

@JohnDuffield We're being cautious. If it seems like it could be physics-related, or could devolve into a discussion that is, we'll ask you to move it to another room.

(And, for the record, yes, we are dealing with both sides of the situation, not just you.)

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

Another room is a great option @JohnDuffield :-)

5

They're so easy to create.

Semi private, no interruptions, etc.

John Duffield

12:55

Anybody like to discuss something?

David Z

@JohnDuffield well, whatever we call it, the messages you were posting are examples of the sort of thing we'd like you to keep out of this room.

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

13:08

"We" are not amused.

Doesn't queen Elizabeth say that? @JohnDuffield

Bass

@ACuriousMind this is a follow-up question on this answer of yours. Maybe you're interested in answering it.

John Duffield

@DavidZ :if you'd like me to keep remarks like this out of the room please ask other posters to avoid derogatory comments like trying to understand Duffield's theory is a fool's errand and it is a patchwork of poorly understood science and old theories that didn't pan out.

I see the derogatory comments are still there.

ArtOfCode

@JohnDuffield Sorry, my fault, I didn't remove them when I acted yesterday. They're going now.

Gone

David Z

@JohnDuffield remember, this is about what you post, not about what other people post.

That being said, we do notice those kinds of comments from others and act on them as needed.

John Duffield

@ArtOfCode : thanks.

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

13:14

Are you happy now?

ACuriousMind

@Bass It's nothing deep. $m^2 = p^2$ is the quadratic Casimir of the Poincaré group, and all irreducible reps of U(1) are of the form $\mathrm{U}(1)\to\mathrm{GL}(\mathbb{C}) = \mathbb{C}^\times, \phi\mapsto \mathrm{e}^{\mathrm{i}q\phi}$ where the charge $q$ defines the representation completely.

Sᴋᴜʟʟ ᴘᴇᴛʀᴏʟ

Do you watch cricket? @JohnDuffield

John Duffield

@Sᴋᴜʟʟᴘᴇᴛʀᴏʟ : I'd be happier talking about gravity.

@Sᴋᴜʟʟᴘᴇᴛʀᴏʟ : not specially. I think it can be nice to have it on the TV on a sunny day, and I have enjoyed being a spectator at a cricket match. But I think the alcohol had a lot to do with that.

Bass

@ACuriousMind Okay, I can see that the irreps of U(1) are completely classified by a parameter $q\in\mathbb Z$. But why is that $q$ the electric charge?

John Duffield

@DavidZ : so, this sentence I received without warning after no incident, is it a life sentence?

Bass

13:21

(more precisely, $q\in 2\pi\mathbb Z$)

ACuriousMind

@Bass Take the usual Dirac action for a fermion transforming in the rep labeled by q and determine the Noether current of the global U(1), then compute the Noether charge. It turns out to be $q \cdot (\text{no. of particles}-\text{no. of anti-particles})$.

So the natural interpretation is to say that $q$ is the charge of a single particles.

In unrelated news, Unikong doesn't work for me :'(

Bass

@ACuriousMind Well but aren't all fermions in the $1/2$ rep? I know that particles with spin $3/2$ or $5/2$ would be fermions too, but all fermions in the standard model have spin $1/2$, so from the point of representation theory, there is no difference between them.

ACuriousMind

@Bass spin is about the finite-dim. rep of the Lorentz group the field transforms in, this has nothing to do with their transformation behaviour under any U(1).

FenderLesPaul

13:37

@BernardMeurer your parents can't help out?

Bass

@ACuriousMind Oh, right. Gonna think about that. Thank you!

FenderLesPaul

@BernardMeurer you're doing for a degree that has a lot of potential return

Emilio Pisanty

@ArtOfCode Just curious, what is 94cfb1fc-f77a-43b4-96a7-842922f7b128?

ArtOfCode

@EmilioPisanty A competition to see who figures out its true meaning first.

Emilio Pisanty

@ArtOfCode I imagine it's not the google result

ArtOfCode

13:49

@EmilioPisanty I don't know what the google result is :)

David Z

The fact that there is one Google result is highly unusual.

Emilio Pisanty

@ArtOfCode answers.microsoft.com/en-us/feedback/forum/fdbk_commsite-mods/…

Bass

@DavidZ GUIDs are unique, so there should be just one Google result ;)

ArtOfCode

@EmilioPisanty Ha! It actually is... well that I didn't expect.

ACuriousMind

Uh...where does that string come from to begin with?

David Z

13:51

@Bass if page content consisted of arbitrary GUIDs, sure, but usually you'd expect a search to turn up links and references. Or, more likely, nothing.

E.g. there are a lot of GUIDs that appear in the Windows registry (or as folder names) that are frequent causes of computer problems, and there will be thousands of search results for those from tech support websites.

Bass

@DavidZ I know, jk

David Z

ahh :-P

Emilio Pisanty

@ArtOfCode Fair enough. I guess I'm just more confused now, but I guess you have your reasons.

ArtOfCode

@EmilioPisanty Yeah. It was there to prove my identity as an SE moderator to a jackass Microsoft Answers moderator.

3075

@ArtOfCode be nice.

David Z

14:05

:-P

Emilio Pisanty

14:19

@ArtOfCode Fair enough, that makes sense.

It's now googleable to anyone who sees your foss.se profile and gets curious, though, so if it's done its job maybe you should put an expiry date on it ;-)

There's a fair amount of bile in that link tbh

Bernard Meurer

@FenderLesPaul I think they could, but I don't believe they are interested ; they don't seem to think it's worth their money. As much as I'd love to I just think it's beyond reach

user116211

14:45

physics.stackexchange.com/review/low-quality-posts/125039

user116211

Why did this answer come to as LQ?

David Z

Because of its length and content, I guess?

(as it says on the review page)

It's hard to tell.

Danu

hi guys

@EmilioPisanty long time no see!

oh.. :(

ACuriousMind

15:01

@Danu Yeah, you scared him away, obviously.

Danu

@JohnRennie ahem ;D

@ACuriousMind The bird has flown :(

Pokemon Theme - Gotta Catch 'Em All - Original Long Version

►

user116211

@DavidZ oh.... I don't what length is acceptable though.... content is not LQ, I guess?

David Z

@MAFIA36790 who knows. I'd say don't worry about why it showed up in the queue.

Though I did later notice it was flagged, that probably explains it.

barrycarter

15:29

The Lorentz transform of the vector (-10, -10) at v=0.8 is (-3.33, -3.33), correct?

John Rennie

x' = \gamma(x - vt) so I get x' = -1.2

t' = \gamma(t - vx/c^2) giving t' = -1.2

user116211

@DavidZ Well, that indeed explains it....

Danu

►

John Rennie

@MAFIA36790 I didn't flag it, but Qmechanic's answer was really a comment not an answer.

Danu

I flagged it again---that should definitely be a comment.

John Rennie

15:35

However I'd say it was a useful comment and I would have left it there

user116211

Well QM has written it as the prelude of the answer, didn't he?

John Rennie

@barrycarter: you made no comment on my answer to your question about acceleratiion

barrycarter

@JohnRennie Yeah...

@JohnRennie I sense today's date has something to do with it

@JohnRennie I was running some numbers myself.

@JohnRennie Today is probably a bad day to be asking questions here :)

user116211

@barrycarter Why?

barrycarter

@MAFIA36790 What part of the world are you in?

John Rennie

15:37

It's past midday here - no asinine jokes from me (well, no more than usual)

barrycarter

@JohnRennie So that was your actual answer? (-1.2, -1.2)?

user116211

@barrycarter Well, does this answer my question?

John Rennie

Yes, why, is it wrong?

barrycarter

@MAFIA36790 It would help me answer your question, unless you want to play "questions only".

@JohnRennie I suspect it is, but I also suspect you're teasing me.

user116211

@JohnRennie: Saw the arcade developed by Stack Overflow?

barrycarter

15:39

@MAFIA36790 I played that, you don't get any real rep points :P

@MAFIA36790 And the high scores is a fake! You can't get on it.

@JohnRennie IE, I suspect your answer is wrong.

John Rennie

Back in 1982 we used to get source code for games like Killer Gorilla and hack it :-)

user116211

@barrycarter: I'm really not making any heads of what you are saying :(

Danu

@JohnRennie After midday jokes are over?

user116211

@JohnRennie Oh! Nostalgic?

John Rennie

@barrycarter In what way? Just feed t and x into the Lorentz transformations and the numbers drop out. Try it for yourself.

user116211

15:40

@Danu: You played it?

John Rennie

@Danu In the UK traditionally all April Fool's day jokes have to stop at midday

@MAFIA36790 they were happy days. At that time the BBC micro was being developed and the Acorn team had close links with the Cambridge IT guys so we used to get early builds of games.

barrycarter

@MAFIA36790 Ugh, today is April Fool's Day... I probably shouldn't have said that.

FenderLesPaul

@BernardMeurer Did you apply to any Canadian unis?

Danu

@JohnRennie Pfft

user116211

@barrycarter Ha! Got all the heads :P

barrycarter

15:44

@MAFIA36790 Umm, what does that mean.

@JohnRennie Crap, you're right.

John Rennie

@barrycarter :: smug grin ::

barrycarter

@JohnRennie I'm pretty sure I meant something else thought :P

user116211

@FenderLesPaul: Oh, I forgot! What happened to Bernard? Do you know?

barrycarter

@JohnRennie And that makes my problem worse, thanks. I wanted (-6,-6) or something.

user116211

oooohhhhh.....

barrycarter

15:45

Holy crap, is there an event or something?

user116211

So many people!!

John Rennie

Am I being mean to this user:

0

Q: What is the amplitude of electric field in a laser?

I'm looking for reliable informations about the amplitude (not the intensity), in volt/meter, of the electric field in a typical laser. Or in other words : what are the typical amplitudes of the monochromatic plane waves in an intense electromagnetic wave ?

Expecting him to put some effort in ...

barrycarter

I thought a laser was all light.

John Rennie

A laser beam is all light, yes. And ... ?

barrycarter

Oh, and thus no electricity involved.

John Rennie

15:47

Light is a combination of an oscillating electric and magnetic field.

barrycarter

Oh, duh. electromagnetic waves.

John Rennie

The OP wants the field strength of the oscillating electric field.

barrycarter

Rennie 2, Carter 0.

John Rennie

@MAFIA36790 they all left. Something you said? :-)

barrycarter

Seriously, is there an event here in 12 minutes or just a whole bunch of people wanting to chat?

user116211

15:48

@JohnRennie aaaahhhh....

user116211

Did someone flag something?

John Rennie

@barrycarter no, there's no event.

barrycarter

Maybe it was a flash mob?

ACuriousMind

Why would you think there's an event?

@JohnRennie You're being reasonable. It's not mean to tell them to look up values on their own.

barrycarter

Because I saw a bunch of people come in, assuming they were wanting to attend an event.

@JohnRennie No matter how I run my matrices, I can only get +- 3.333 and +- 30 out of the transform. Blargh.

user116211

15:51

@barrycarter You'd be notified of that earlier if there were any event....

barrycarter

@MAFIA36790 Oh, auto notification of upcoming events occurs here?

user116211

@barrycarter kinda.

John Rennie

@barrycarter: I have to confess that I still haven't worked out where the missing time is going in your acceleration example.

barrycarter

@JohnRennie No, I think you explained it really well.

@JohnRennie I'm going to look at your answer one more time... something is rotten in the state of Denmark

John Rennie

@barrycarter seeing the light from the earth clock yes, but working out how the earth time coordinate transforms into the accelerating twin time coordinate has still escaped me.

barrycarter

15:56

@JohnRennie Umm, did you intentionally reciprocalize the gamma in your answer?

John Rennie

Oops, bollocks :-)

barrycarter

@JohnRennie No, I think you provided an explanation of what both observers would see (btw, they don't have to be twins, although I suppose they could be)

@JohnRennie Fie fie fie!

John Rennie

Yes, it is (-3.333, -3.333)

barrycarter

@JohnRennie The japes and shenanigans have not ended, have they!

John Rennie

That's what comes of rushing through a calculation in my head

Obliv

16:01

Hey who was that guy who discovered some math and wrote it under a bridge? What was it he discovered, vector products?

John Rennie

Hamilton - quaternions

HDE 226868

Hamilton.

barrycarter

@JohnRennie I'm pretty sure you were teasing me :) And I could even "prove" it, but no point. Tis the day for merriment of all sorts.

Rennie 1, Carter 1

John Rennie

@barrycarter No, it was a genuine error born of excessive haste

Obliv

In layman's terms, what are quaternions? It looks very similar to a 3D vector product.

barrycarter

16:04

@JohnRennie Hmmm... let me just say that I have a great deal of respect for you and I don't think your intuition would let you believe 10 could become 1.2 at 0.8c. It's hard enough to believe it becomes 3.333. If you'd said something like 6, I would've totally believed it.

user116211

@Obliv Google it?

barrycarter

@Obliv Yes, that's almost exactly what they are.

@Obliv With the addition of a constant term.

Wow, someone starred both the original and updated scores.

ACuriousMind

@Obliv Quaternions are like complex numbers except with three distinct roots of -1 instead of only 1. By not-entirely-coincidence, quaternions of unit norm describe rotations, in 3D, which is why you might be reminded of the cross product.

Obliv

@ACuriousMind Why are the vector parts of a quaternion labeled 'purely imaginary'? Is it because the ijk axis are imaginary axis?

barrycarter

Because i^2 = j^2 = k^2 = -1

John Rennie

16:10

@Obliv John Baez wrote a nice article on the division algebras:

math.ucr.edu/home/baez/octonions/node1.html

Obliv

why is it defined that way? Why not =1? @JohnRennie Thanks I'll look into it.

barrycarter

Well, their 4th powers are all one, just like the imaginary number.

@JohnRennie You are a cruel cruel man.

John Rennie

@barrycarter I am? I think John Baez's articles are generally excellent. I wish I could write half as well as him!

barrycarter

@JohnRennie Your link is to an article about the octonions, the ugly cousins of mathematics about whom we must never speak.

ACuriousMind

@Obliv "Why is it defined that way?" is not really a sensible question. You can also extend the reals with something that squares to 1 but isn't one, but that's a different kind of algebra, not the one we call complex numbers (or quaternionic numbers).

barrycarter

16:13

Am I the only one who thinks of Joan Baez whenever someone mentions John Baez?

John Rennie

OIC :-)
Though I think discussing the four algebras as a whole presents a nice perspective.

ACuriousMind

@barrycarter They're cousins or something, I think

John Rennie

John is Joan's cousin

barrycarter

Wow.

ACuriousMind

And again I strike seconds before @JohnRennie ;)

barrycarter

16:14

Yes, but for someone just learning about the quaternions, the octonions are a bit much. Without associativity, we don't even have a group.

Obliv

@ACuriousMind I'm just going to read this article and any questions I have at the end I'll post here. I'm too misinformed about this math lol.

John Rennie

@ACuriousMind admit it, you are really an IBM AI pretending to be a physicist

ACuriousMind

@JohnRennie Well, that's wrong, I don't work for IBM...

barrycarter

Technically, an AI wouldn't "work" for IBM.

John Rennie

@ACuriousMind are you any good at Go? :-)

barrycarter

16:17

Suspiciously specific denial.

ACuriousMind

Haha, I don't even know the rules

I'm also rather bad at chess

barrycarter

And you can't even win at Tic Tac Toe?

ACuriousMind

@barrycarter That is one game I have mastered :P

barrycarter

They say that the newer AIs will be intentionally bad at complicated games to give them a more human appearance.

ramsay

what do wavefronts mean (*I am now studying sound waves*)
I saw wikipedia page but it was hard for me to understand there :(

barrycarter

16:27

They're the fronts of waves.

ramsay

front of waves?
how can wave have a front side?

ACuriousMind

@ramsay The "wavefront" is just usually just a line that you draw along which all points have the same amplitude.

barrycarter

@ramsay Sorry, I was trying to be funny. A "wavefront" is just the amount of amplitude you'd see if you were standing at a given point.

@ramsay Or what @ACuriousMind said.

ramsay

thank you @ACuriousMind and @barrycarter

John Rennie

@ACuriousMind same amplitude or same phase?

ACuriousMind

16:35

@JohnRennie Oh, yes, if you want to say it properly you have to say that a wavefront is the region of space in which all points are at such a distance from the emitter that their distance divided by the propagation speed is the same.

John Rennie

That wouldn't work for an infinite plane wave.

A wavefront is just a surface of constant phase.#

ACuriousMind

And how do you define "constant phase"?

The infinite plane wave doesn't work, but it's an idealization, anyway. If you take it as a spherical wave far away from the emitter, it works.

ramsay

hey i am not able to digest "line" word!
because in my book it is given sound waves have "spherical" wavefront, so it means a "curve" joining same amplitude is a wavefront, *right*?

barrycarter

@ACuriousMind I think @JohnRennie was just pointing out that the amplitude is equal at -e and +e for arbitrarily small e (or actually any value of e), so saying the amplitude is equal doesn't suffice.

ACuriousMind

@ramsay Oh, I said "line" because I was thinking in 2D. In 3D a wavefront is a surface, not a line.

ramsay

16:40

great, it made sense :-D

Danu

@JohnRennie How about you?

John Rennie

@Danu Never played it.

I've played chess, but only at rank beginner level

Danu

I'm always looking for new chess opponents

Bernard Meurer

16:59

@FenderLesPaul yeah, University of Waterloo

user116211

17:09

@BernardMeurer: o/

user116211

@BernardMeurer: Did you find your college?

Obliv

17:39

hey what do you guys think is better, axler or halmos to learn linear algebra?

3075

@Obliv I use axler as a reference.

and it's also really commonly used in universities so I'd say go with that.

Bernard Meurer

@Danu Want to play some chess? I'm very bad but I really like playing

Obliv

@BernardMeurer @Danu I'd like to play you both a couple times :D do you use lichess or chess.com?

Bernard Meurer

chess.com :)

Obliv

@BernardMeurer what's your user ill add you

Bernard Meurer

17:48

bemeurer

Nazmus Saadat

Hey, if any of you guys are free coul you answer this question of mine physics.stackexchange.com/questions/246789/…

I posted it an hour ago and still haven't received any responses. This is the longest I've ever had to wait to get an answer. It's maddening!

ACuriousMind

Chill, an hour is nothing.

Nazmus Saadat

3600 seconds

Obliv

@NazmusSaadat I've waited days for a response :p it's even worse at physicsforums.com

Nazmus Saadat

But..but..Waiting is hard.

ACuriousMind

17:53

You shouldn't expect answers to come directly - that only ever happens if you either asked such a simple question that almost everyone can answer it or if you were lucky and someone with expertise in that field was online and saw your question and had time and inclination to write an answer

Have a bit of patience.

Nazmus Saadat

Alright. I'll wait. Meanwhile anyone want to play chess?

Obliv

waiting on @BernardMeurer atm, you can open a lichess.org game and link it here and you'll probably have someone join

Bernard Meurer

@Obliv I've added you on chess.com already

I hope you're as bad as I am

Obliv

@BernardMeurer You have to log into livechess so I can challenge you

Bernard Meurer

I am

Obliv

17:55

I see you now :p

Danu

@BernardMeurer add me on chess.com; I'm DanuThung

Bernard Meurer

@Danu Added

vzn

18:25

6 hours ago, by ArtOfCode

@JohnDuffield We're being cautious. If it seems like it could be physics-related, or could devolve into a discussion that is, we'll ask you to move it to another room.

lol, oh! thx for clarifying that!

barrycarter

So cruel.

barrycarter

18:52

Anyone willing to help me with relativity?

@JohnRennie I summon thee.

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