5:00 PM
No plates?

No, the plates still are the full set from when I moved out.

Anonymous
I normally do use ceramic plates at home. But I guess the widespread usage of metal plates here, is due to the fact that they're cheap and easy to maintain. Also, dishwashers are quite rare over here.

Not even a chip?

@Sid yes, but usually I use a dishwasher.

Anonymous
So, you use a dishwasher and then say that you've never seen plates break during washing? That's quite obvious , you know.

5:04 PM
@Blue I don't think there's anything wrong with using metal plates, but I'm skeptical about the practical advantage - I wouldn't have expected metal to be cheaper than ceramic since it has to be quality steel (right?) and I'm not sure how ceramic would be harder to "maintain"

Anonymous
@ACuriousMind Uh, no. They're not really made of "quality steel". They use cheap metal plates in the local shops

Anonymous
Like Rs. 10 or Rs. 20 for a small metal plate

Anonymous
Very cheap

But what are they made of, then? You can't use something like nickel or copper since that would get into the food (right? Please tell me these don't poison your food...)

Ceramic tends to chip.
Like glass.

5:06 PM
@ACuriousMind mild steel typically

And I guess copper is not all that cheap, either...

@Blue I said I usually use one.

And I suspect you underappreciate how chep it is to hammer a disk of mild steel into something vaguely plate shaped.

@JohnRennie So they rust?

@ACuriousMind not if washed then dried
Cast iron pans are widely used in the west ...

5:08 PM
@JohnRennie But they're coated/seasoned - you don't actually get the iron exposed to anything if you're doing it right
I'm just skeptical this is in any way easier than using ceramic plates that don't corrode at all, but if the plates are made of cheap steel then I can see the price argument

Hi @JohnRennie ! Do you know what was the need of shell theorem when we already had the concept of centre of mass?

@ACuriousMind I think you're over analysing this. Mild steel is dirt cheap, unbreakable, and doesn't rust if properly treated.
@Abcd Newton's shell theorem?

Yes.

The shell theorem and the concept of centre of mass are different.
Objects that aren't spherically symmetric do not behave like point masses at their centre of mass.

Acc. (according) to both we can treat the shell as a particle with its mass concentrated at its centre (of mass).

5:12 PM
That applies only to spherically symmetric objects.

@JohnRennie I guess I'm trying to understand why we'd use ceramic plates if there's no disadvantage to using steel ones. Is this purely cultural?

@ACuriousMind I don't know ...
Ask on the Anthropology Stack Exchange? :-)

Some clues here. As always, how reliable these results are is debatable.

@JohnRennie Doesn't seem to exist, and the area 51 proposal that once existed is deleted :P

5:18 PM

Anonymous
@ACuriousMind Yeah, that conductivity is a point too. When you have very hot rice just out of the pressure cooker, you'd want it to cool down fast. :)

Huh, it appears ancient India has long been a major center of steel production, which might explain a traditional inclination to produce household items from it
Whereas the Europeans only caught on later and tended to not make anything out of steel where it didn't provide a significant improvement, I guess?

I only heard the other year that the Iron pillar of Delhi is highly resistant to rust, its been there since the 3 or forth century CE.

@ACuriousMind do physicians have a special word for functions in the kernel of the Hamiltonian?

5:33 PM
@0celo7 I don't think physicians know what a Hamiltonian even is

@ACuriousMind someone who does physics
Physiker

Anonymous
@ACuriousMind In early and medieval Europe ceramics were very popular, from what I know. Similar in China. So probably the tradition has just continued

When I hear kernel I usually think of group theory these days, ie taking the kernal of a group morphism; theres kernels in integral equations too.

Anonymous
@MoziburUllah True, that's a good example

5:37 PM
I can't say I've heard of a kernel of a Hamiltonian - whats a good example?

@MoziburUllah anything with zero energy
the Hamiltonian is a linear operator so it has a (possibly trivial) kernel

@0celo7 I don't think there's a special word for that since most will also tell you that you can add arbitrary constants to the Hamiltonian without changing the physics

@ACuriousMind but that radically changes the mathematics >:(

@curiousmind: aren't there also terms that you can add that points to a theory being formulated as a gauge theory?

right now I'm thinking about dubbing them $L$-harmonic functions

5:39 PM
@curiousmind: what do you think of the Ahranov-Bohm effect thats supposed to show the existence of a gauge potential as being fundamental rather than the E & B fields?
If I have that right.

or maybe Schr\"odinger-harmonic?
That's too wordy

@MoziburUllah Yes, you can introduce gauge-fixing terms into gauge theories, but that's not really the best indication that you have a gauge theory on your hands - the clearest indication is the solutions to the equations of motion being non-unique.

What was his suggestion?

"function in the kernel of blah blah"
I just want a catchy phrase

5:46 PM
@MoziburUllah I think it shows less than is commonly claimed - since it doesn't indicate the importance of $A$ itself but merely of line integrals of it over closed curves, which is the flux through the area bounded by such a line - but together with the fact that a least action formulation in terms of $E$ and $B$ instead of $A$ is very ugly and infeasible I think it's enough to show that we should think in terms of $A$, even if we don't, strictly speaking, need to.

It took me a while to understand that taking a local section of a bundle was what tied it to the physicsist description.
Maths'n'physics - its like learning two languages...
when it ought to be just the one ;).

oh god no
it would ruin math

@oolb: !ollb ereht ih

and physics

@ocelo7: c'mon, calculus was invented for physics!

5:51 PM
@ACuriousMind Now that I just had my dinner, I think it is due to the fact that Indian cuisines are more "wet" and varied that we use metal trays rather than ceramic plate

@MoziburUllah and we had to fix calculus in the 1800s

physics is more edgy though i feel
that's why i like it

@ooolb: that was 'hi there blooo' backwards.

Math needs physics ideas but certainly not the physics language.

@0celo7 let's all agree that physics has the best notation in any field ever.

5:52 PM
No, what a ridiculous notion.

Anonymous
Math is useless it is used in physics or engineering or computer science :P

Physics notation is so scattered and inconsistent that your claim doesn't even make sense.

maybe two languages are good because they let us look at something in more than one way.

@MoziburUllah Exactly.

Again disagreeing with well-established famous mathematicians/physicists there Oce quantamagazine.org/…

5:54 PM
having said that, look at what happening in the 70s - gauge theory and bundle theory were found to be the same thing described differently!

@bolbteppa Unless you give me a quote I'll ignore you as usual

It also means having to learn two languages.

@0celo7 that's cold

My loss

ice cold
i like it

5:55 PM
@Kaumudi.H: Hi, hows the exams going?

Physics notation being sloppy is just a recognition of the fact you're supposed to know what they mean and are not able to keep up :p

Things have to sloppy before they can get rigorous..

@0celo7 @bolbteppa "Minhyong Kim wanted to make sure he had concrete results in number theory before he admitted that his ideas were inspired by physics."

@ooolb bolbteppa is incapable of actually reading or understanding anything I write. That quote is directly supporting my point.

Mathematicians can be sloppy too. Look at algebraic geometry in the 1920s and look at it now.
No it scares people...
Now...

5:57 PM
@0celo7 when tsundere goes yandere

Algebraic geometry was also boring back then, and now so abstract that it's boring again!

that's a good name for that article

'Math needs physics ideas but certainly not the physics language' so the guy thought it up using physics ideas, but not using the language, makes no sense, you are saying the language he used to think it up is irrelevant when he needed that language to even think it up, it's a ridiculous thought

NB flags are for posts that are seriously offensive. That's seriously offensive.

@JohnRennie Was I flagged?

5:58 PM
It's just insulting physics while complementing it at the same time on the same point

Please don't use them for posts that are merely mildly annoying.

Its a love/hate relationship...

I love physics, but I'm not too keen on the people doing it :P

what is going on here

If they have different languages how are they going to understand each other...

5:59 PM
Apparently there are flags.

I like flags.

@0celo7 once you get used to the notation and can keep up you'll like them a lot better ;)

What was flagged?

Nothing was flagged. I just like flags - real ones you can wave and watch them flutter in the wind.

@MoziburUllah it's the same language, e.g. tensors is a great example, old notation vs. linear algebra notation, same thing though people seem not to see it and really get angry at the old way

6:01 PM
Ugh, I refuse to talk about tensors again

Minhyong Kim is a pretty cool guy. What did he do

@BalarkaSen top 10 anime confessions

Physicists have this fascination with them. They're just multilinear maps -- stop circlehecking over them.

Tensors are fine things even better than vectors.

apparently spinors are tensor densities, I just find that fascinating

6:02 PM
Spinors are square roots of vectors <-- cryptic statement of the century

@0celo7 Yeah I am not sure why they are excited by it. It's the most natural thing ever.

I thought spinors were group reps from a universal cover?

There's not much bragging rights in being invariant under coordinate changes

Quantum mechanics is the square root of probability!

spinors are also projective representations (i.e. fake reps), as well as reps of a double cover, etc... lots of craziness

6:03 PM
@MoziburUllah They are. But @bolbteppa loves to post these ridiculously vague "eureka moments" about math he doesn't understand.
I was just mocking him.

The reason I post is because I don't understand fully obviously

Thats the thing about the net - you can't hear peoples tone of voice...

@MoziburUllah Poe's law.

It's sheerly crazy how complicated spinors are

@MoziburUllah hi curious what your Msc physics is on

6:04 PM
@bolbteppa I agree with you there.

@MoziburUllah i use small letters when i am in a memetic mode

@vzn: it was in two parts - differential geometry and TQFTs.

and that square root thing from Atiyah, 'spinors are the square root of geometry', is not helpful

@BalarkaSen What Are You Trying To Say?

Oh dude TQFTs are cool

6:04 PM
Is gravitational field zero anywhere inside the earth or only at the centre of the earth?

I don't know much about them but it feels quite fascinating

@Abcd I think the shell theorem says it's zero everywhere inside, no?
Oh nvm that's for a hollow planet.

@BalarkaSen: I found them fascinating too ;).

@Abcd only at the centre

@JohnRennie Okay, thanks. I got confused. I hope shell $=$ hollow sphere.

6:07 PM
@JohnRennie So I had a discussion with a British prof of mine, he said that one should use a z for "realize" because it's closer to the original Greek.

@MoziburUllah I learnt them from Lurie's Cobordism Hypothesis paper
It was very exciting

And that there's a section of British academia who use z over s in such words.

@BalarkaSen: but I kinda felt I was missing the real physics - which was frustrating; my background is in maths.
@BalarkaSen: It was reading John Baez TWFs that got me into them.

Ah yes I must say I don't know the physical foundations for them

@0celo7 it can be entertaining to argue about such things, but at the end of the day it is roughly as productive as self abuse and less fun.
7

6:08 PM
lmao

@JohnRennie He also said that "color" is correct, but "neighborhood" is not.
It's very confusing.

The English language is a bastard mongrel of a language

@0celo7 as opposed to colour?

@ooolb Yes.

Linguists apparently say everybody is right, it's completely random, no rules, depends on consensus

6:10 PM
@MoziburUllah Good to hear you're a math undergrad.

zzz

We'll have some interesting discussions probably

People argue about which words have come from what source and therefore how they ought to be written and pronounced, but ultimately no-one cares.

@BalarkaSen holonomic approx.?

@BalarkaSen: Thanks.
@BalarkaSen: is your background in maths or physics?

6:11 PM
Balarka is 13

@0celo7 He's 17 if I am not wrong.

coming from ooolb that would be 31!

@0celo7 Not right now. I have some work I should get done

It's amazing trying to read math in another language and using some of the tricks that exist which really work to help you understand the meaning of words by deconstructing them, stunning how far you can go
e.g. throw away the vowels

Arabic and txtng throws away vowels.

6:14 PM
lol "txtng"

i don't think that pun was intended.
but i'll take it

I was always a fan of the story "MS Fnd In A Lbry"

Is that a real story?

Yup
Look it up, it's a very nice little story

I will!

6:16 PM
Because so many words were inherited in languages like French and English from some old languages, and also because a lot of words in math/physics were taken from Latin/Greek, means a huge proportion of words are decipherable through tricks which is very helpful

Just checking - never know with this lot ;).

Haha

Yeah, thats why Latin and Greek always look familiar.
I feel like I ought to be able to read it - but I can't.

@Abcd Balarka has forgotten what he is..

I often forget where I am...

especially when I'm on the way to somewhere important..!
Peter Gabriel was he in Talking Heads?

Haha, good catch
The tune sounds like it's coming from Talking Heads
But no, not really :P
I really like the album "Melt", from where this song is.

well, this is enough for for a day i.gyazo.com/51d06bd59617cde783058c988cbf997b.png
time to procrastinate
Hmm, I need to compute those
how does that actually work
oh, stereographic projection

@BalarkaSen: I like the album cover.

@Semiclassical hola

6:29 PM
@MoziburUllah Me too

@BalarkaSen: I'll give him a spin some time soon - I'd forgotten his name, glad you reminded me.

No problem! Feel free to talk to me about weird music, weird movies and weird math - those three are my specializations :P

Cool!
You ever heard of the Cocteau twins?

Anonymous
@BalarkaSen You're forgetting the most important specialization.

Weird books?
Weird Physics?
Weird people?

Anonymous
6:32 PM
MAYMAYS

weird physics is @Slereah

Being specialized in weird memes is not a thing you'd want to put on your CV

Its a thing I'd like to put on my CV!

@BalarkaSen wait are you saying i should remove it???

@BalarkaSen I should ask Morwen if he knows any memes

Anonymous
6:34 PM
@BalarkaSen Being interested in "weird music, weird movies and weird math is also not something you should be putting in your CV :P

HP Lovecraft!
A Hundred Years of Solitude!
Lorca!
Neruda!

Love Marquez and Neruda

@Blue fok normies

The last two are poets. I write sometimes. But I won't inflict any of stuff on you guys...unless I'm in abd mood.

Hah

6:37 PM
I've tried, once some time ago, but I couldn't get into it - it seemed to heiratic.
Hah? Now I'm in a bad mood! ;).

What do you mean by Borges being heiratic?

@BalarkaSen weird music eh?
love dis

Maybe I should give it another go. I couldn't get into Marquez's A hundred Years of Solitude, but a couple of weeks ago I opened it up and found myself liking it.
@BalarkaSen: not sure - but its a cool word to throw around...
Sort of hermeneutic...;).

@BalarkaSen if you think i'm a weirdo bandwagoner though you're wrong
i loved that since like 2013
still my jam
BEFORE it was cool to be weird

I like the opening static...

6:41 PM
@MoziburUllah lmao

my fav part is 6:35

Have fun

Imao?

loling my ass off

@ooolb: Now thats weird ;).

6:42 PM
What does "infinitely" away from earth mean :/ ? What's the use of calculating escape speeds?

i know merzbow

@0celo7 laughing*

@BalarkaSen i'm a noise junkie
this is nothing

are you sure?
loling makes more sense

@ooolb Oh nice

6:43 PM
'abcd:far away from the earth so you neglect the earths gravitational field...

Anonymous
I feel lol is going to enter the Oxford dictionary soon

Somehow the word 'noise' crept into my mind too...
or LOL

@MoziburUllah what's the use of calculating escape speeds? It just seems meaningless to me.

because if you don't escape you're simply in orbit around the earth.

Anonymous
@MoziburUllah I mean as a real word, not an acronym. ;)

6:45 PM
@BalarkaSen to be fair you have to have a really high iq to appreciate noise music
the symphonics is incredibly subtle

@ooolb: you ever heard of Spaceman 3?

@MoziburUllah Do you know a good reference for TQFTs? I'd like to save it for future purposes
Not an encyclopedic reference, more of a panoramic one

@BalarkaSen i started listening to noise cuz since i was a synesthete sometimes i just wanted to drown out everything where normal songs always had distinct shapes or colours
noise was a clusterfuck in my head
relaxing

@MoziburUllah Why do people care about sun's escape speed from the earth?

6:47 PM
@balarka sen: Have you heard of John Baezs TWF?
He's pretty good for the paranomic view.

Yeah I have read isolated articles from it
I shall try it
I have to go for a while now. Be back in a while

Ok. Cheerio.
@abcd: The earths chasing the sun - who knew!
Spaceman 3 was my first introduction to noise music.
Transparent radiation was intoned over spacy static.

i mainly only listen to aube because I love his style
and he has like 30000 songs
so i don't run out

Holy Jesus!
30,000!
it figures ;).
I played this once to some hip-hop guys and there were like...!!!!
Actually, it does sound symphonic...
I'm listening to it now.
Takes me back.
@abcd: the earths not escaping from the sun - its in orbit.

that's not noise buddy
that's ambient

6:59 PM
@ooolb what is your profile pic supposed to be

a cute anime girl
rei ayanami