The h Bar

Avantgarde

12:02 AM

Which comment here has received the most stars?

$s^{t^{{a}^{{r}}}}$

Finally!

David Z

12:21 AM

@enumaris Another way to say it: it's fine to ask about something that you only thought about because of a homework problem, but don't ask for help on the homework problem itself.

One reason we make a big deal about showing your work is to get people who would otherwise ask for the answer to their homework problem to ask about something else.

Fawad

1:38 AM

😃😄😄👍👍😃😃

Eid Mubarak

Eulb

3:27 AM

can 0celo7 be unbanned already please

it's been 3 months give him a break sheesh

user1732

not gonna happen, pal :(

Eulb

we need real mods on physics

all of them work 9-5 jobs and don't do physics anymore.

user1732

where are we gonna find these "real" mods?

Eulb

Qmechanic is the only real and deserving mod

user1732

yeah, he's a good one :-)

very professional

whelp, there is no pay

Eulb

3:37 AM

they just ruined the h bar for everybody, there's no point in coming here anymore, all the cool people left, 0celo7 was the only invariant member as others came and went but now he's booted too unfairly.

user1732

that's what they wanted

John Rennie

4:22 AM

I have to say I think the room works a lot better now than it used to. We get some awesome discussions about physics and there hasn't been a flag for weeks. That is pretty much all you could ask of a physics chat room.

user1732

again, that's what they wanted :-)

but, like mick jagger said "you can't always get what you want"

Cows

4:51 AM

hi :)

Captain Bohemian

7:48 AM

I just learnt octonian; I am still reading it on Wikipedia, which seems to say it's something like quaternion.

John Rennie

8:02 AM

In a non-associative sort of way :-)

Akash. B

@JohnRennie do you have another copy?

John Rennie

@Akash.B I don't have a spare copy I'm afraid.

There is an ebook version floating around the Internet but you really need a paper copy for a book like this.

Captain Bohemian

@JohnRennie why is the dimension of octonion only 8, rather than $2^8$, the dimension of a Clifford algebra generated by a 8-dimnsional basis?

John Rennie

@CaptainBohemian no idea

Captain Bohemian

8:19 AM

@JohnRennie mybe I find the reason--the multiplication rule of octonions is different from that of a Clifford algebra.

Secret

8:30 AM

sciencedaily.com/releases/2018/08/180820114121.htm

A decision made billions of year ago...

nature.com/articles/s41534-018-0079-x

It does seems we need to start thinking about not just noise, but adding unpredictability itself into a system and see what happens

John Rennie

The Test match is not looking good for England ...

Anonymous

Ah, England Vs. India.

user1732

9:02 AM

if i knew there was talk of a test in here, i would've studied :P

\o Blue

user1732

9:16 AM

TIL International cricket in South Africa from 1971 to 1981

Anonymous

9:42 AM

@user1732 Morning

Anonymous

What's up?

Akash. B

hi

user1732

@Blue chillin' you?

Anonymous

@user1732 Doing homework :)

user1732

10:21 AM

Terrence Tao needs help programming

Anonymous

@user1732 Can't access without an account

user1732

:(

make one

Anonymous

@user1732 What's the summary though? I read on his blog that he needs some javascript help for his new logic game

user1732

> due to my inability to come up with a good general-purpose matching algorithm(or even specification of such an algorithm) for the the laws of first-order logic, many of the laws have to be hard-coded into the matching routine, so one cannot currently remove them from the text. It may well be that the best thing to do in fact is to rework the entire codebase from scratch using more professional software design methods.]

Anonymous

10:36 AM

@user1732 Ah. He could hire some CS students from his uni for the work

Anonymous

Or actually, he's Terence Tao. Many people would help him for free :P

user1732

make an account and follow his blog

Anonymous

Not feeling like doing so.

Anonymous

I read his blog occasionally though.

user1732

9

A: What programming language should a professional mathematician know?

My answer is: TikZ This is a programming language, often used in combination with LaTeX, for producing high-quality graphics. I view this language as important for mathematicians, not because mathematicians will use it to solve their mathematical problems, but rather, because mathematicians wil...

would a similar question for a professional physicist be off-topic?

or even chemist? @Loong

Anonymous

10:45 AM

@user1732 Does knowing TikZ even classify as knowing a "programming language"? I thought anyone who has to write math or physics papers has to learn it at some point of time. Pretty much impossible to draw good diagrams without it.

user1732

I guess there are still some "old timers" around :P

Avantgarde

11:01 AM

@Blue I still have to learn it :P

Anonymous

@Avantgarde It is actually easier than I thought. There are some nice tutorials out there. I'm using it to make some quantum circuits :)

Avantgarde

Actually, I think we could have a a TikZ SE in conjunction with Latex SE.

Anonymous

@Avantgarde TeX SE is a good place to ask TikZ questions too

Avantgarde

@Blue I never really tried it. Yet. I know I will, soon.

@Blue I will be there :P

Anonymous

You have several of the core developers of TikZ on that site too

Avantgarde

11:04 AM

Oh wow that's amazing. Then that's the perfect place to ask. Thanks for the info.

I could give them to do "my homework" :P

Anonymous

Haha, they do help you with "homework" as long as you can provide them a MWE :P

Anonymous

(minimal working example)

Avantgarde

Sure, I'll copy and paste an example from their documentation.

Anonymous

Lol :P

John Rennie

I have to say that using TikZ for diagrams seems a bit like using assembler to write programs. Yes you can do it but wouldn't it be better to use a higher level tool?

Anonymous

11:10 AM

@JohnRennie There isn't a higher level tool for the type of diagrams I'm trying to draw afaik :/ Also, most image editors don't have LaTeX support (in case I want to write equations on my image). And if I try to use an image editor it compromises on the quality, often

John Rennie

In the good old days the equivalent would be Postscript. You can draw diagrams by hand coding Postscript (I have actually done this) but what you'd actually do is use Adobe Illustrator and have it export an EPS file.

Anonymous

11:22 AM

@JohnRennie That is an option, yes. But I think TikZ offers a lot more flexibility and precision. Also, once you set up a few manual libraries and customize them according to the type of diagrams you need to create on a daily basis, it gets a lot faster! We just got to import a couple of customized libraries, write 4-5 lines of code and end up with a well made circuit diagram like this:

Anonymous

Anonymous

I mean it is helpful if you got to create similar diagrams regularly, with not much significant variation

Anonymous

Now, I could just tweak the parameters a bit to create almost any quantum circuit in the Nielsen and Chuang textbook in like 10-20 minutes

Avantgarde

12:25 PM

@Blue What are quantum circuits? That is something to do with quantum computation?

Akash. B

Is there a time dilation near black holes?

Avantgarde

What do you mean?

Akash. B

can you elaborate?

Anonymous

So, I just discovered.. when you click on an image on the xkcd site, they have quirky image titles.

Akash. B

@Avantgarde what is the thing that you didn't understand?

Avantgarde

12:35 PM

@Akash.B What do you mean by "time dilation near black holes"?

Akash. B

@Avantgarde time moves slower when we go near extreme gravitational field, right?

general theory of relativity

Avantgarde

@Akash.B When compared to an observer who's in a weaker gravitational field, yes.

Akash. B

@Avantgarde what about the observer in extreme gravitational field ?

Avantgarde

@Akash.B Then that's the proper time observed by him/her. In order to make the statement that "time has slowed down", you need another observer with which to compare to.

That's the whole idea of 'relativity'

Things slow down with respect to something.

Anonymous

@Avantgarde Yep

Anonymous

12:42 PM

See the example image above

Avantgarde

@Blue That's dope. So you're building a superquantumcomputer?

Anonymous

@Avantgarde Lol, nope. I'm more of a quantum algorithm guy :P

Anonymous

Not an experimentalist

Novalium Company

Hello everybuddy.

Akash. B

hi

Avantgarde

12:44 PM

@Blue So what do you do? Devise new algorithms?

Hey Novalium

Akash. B

2 mins ago, by Avantgarde

Things slow down with respect to something.

something?

Avantgarde

Well, I mean don't read too much into "something". I just meant that you need 2 things to compare.

Akash. B

what are those?

Anonymous

@Avantgarde Sorta? :P I'm still in the learning stage. I find quantum information more fascinating tbh but I don't get much time for it :/ Till now I only corrected one algorithm which was published in 2013. Hoping to publish the correction sometime soon.

Avantgarde

That depends on the question you wish to answer. Like time on earth, and time on a spaceship 2000 km away.

@Blue Oh nice, that seems pretty good.

Anonymous

12:48 PM

@Avantgarde Also you need someone to program the quantum computers to do useful stuff once they're created :P Quantum machine learning is a new and exciting field in that respect

Anonymous

So in some way the work I am doing is mostly imaginary XD

Avantgarde

@Blue I see. I know nothing about Qcomputation.

or theoretical

So you're the string theorist of quantum computation.

Anonymous

@Avantgarde Bad comparison, but okay :P I so wish I get even close to knowing all the pre-requisites for string theory (which seems to be a broad field in itself)

Anonymous

I haven't even come about learning GR completely :/

Avantgarde

Quantum string circuits. Man, do it.

Anonymous

12:51 PM

Hopefully I can take up some grad classes in advanced physics/math. Difficult to make the transition as an engineering student though.

Anonymous

@Avantgarde lol

Avantgarde

@Blue Yes, that's true. But it can be done. Also a lot of studying yourself.

Anonymous

@Avantgarde True, I am currently trying to pick up basic GR from Schuller's lectures online. Time is a major constraint. :( Too many lab reports, homeworks and assignment. I want my undergrad to get over as soon as possible so that I can learn whatever I want to learn (though that might always remain a dream...lol) :P Thanks for the encouragement though!

Avantgarde

@Blue Oh I've seen some very few lectures by (Frederic?) Schuller. He's a good explainer.

well, do what you can with what you have. :)

Anonymous

Yep. And his German accent is cool too. I like his very mathematical appoach to GR instead of the common physicsy approach.

Anonymous

12:59 PM

@Avantgarde Hehe, I will :)

Secret

1:19 PM

nature.com/articles/s41567-018-0264-z

Not the prettiest pictures of quantum flucturations out there, but it is a further step towards better understanding these transient processes

nature.com/articles/s41567-018-0197-6

Quantum equivalence principle proposal: Mass and internal energy do not commute if this is true.

Moreover, states under freefall will exists in a superposition of masses and then became correlated or entangled

I am more interested when local lorentz invariance is violated though, because that will mean we may be able to meddle with time a lot more

danielunderwood

3:05 PM

Any chance you guys know what you'd call something like a time-dependent bar chart chose opacity is a time average?

Like an equalizer type thing where instead of just jumping back down, it fades out

Emilio Pisanty

3:22 PM

@Secret they're just handing the PRLs out to anyone these days, it seems

I really don't see how this significantly adds to what the previous experiment (i.e. using hundreds-of-years-old starlight) already brought to the table

Secret

3:35 PM

I am not sure either, in fact, I am not so up to date with this free choice loophole that I don't see how using ages ago starlight will rule out classical correlation since the photons that are actually entangled in the experiment are not from the starlight photons, and the starlight photons only controls the measurement process

Secret

4:20 PM

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