The h Bar

Maxime

15:00

idk but it seems good

if someone agree with me

Anonymous

@Maxime I personally agree with you, but the site policy isn't going to change

Maxime

then everyone will be on math.se

Anonymous

The questions which you speak of are allowed in the chat though

Maxime

its not important to get an answer for my question

Anonymous

@Maxime We have no problem with that

Maxime

15:02

the important thing is to make this community better.

Balarka Sen

@Maxime That is the fundamentally flawed aspect of your idea. Not all of the OP's want to do their own work; they want people to do their work for them. This is one of the reasons the quality of questions in math.SE has dropped drastically: ask any regular on the math chat.

Maxime

can you take a look the questions tagged by homework-exercises

all of them %90 off-topic

or saying same thing like robots

Balarka Sen

Most of the questions in math.SE are homework help at this point.

Maxime

Despite your impassioned pleas we don't answer homework or worked example type questions. Please see this Meta post on asking homework/exercise questions and this Meta post for "check my work" problems. –

Emilio Pisanty

@Maxime To be blunt: you're not a member of this community, and you're showing zero interest in the opinions of other members of this community.

ACuriousMind

15:04

@Maxime Stop trolling this chat room and creating sockpuppets to pointlessly debate the homework pölicy.

Maxime

why is math.se more succesfull?

Emilio Pisanty

@ACuriousMind can we remove the troll's vandalism from the star board?

@Slereah tell that to Sonny White

=P

Slereah

@EmilioPisanty Well you know

I am skeptical, but if it gets some interest in the field

I'm not gonna complain

Emilio Pisanty

@Slereah well, that's the PETA approach to "there's no such thing as bad publicity", no?

Slereah

The antigravity GR device I don't think I've ever read about outside of that NASA book

Balarka Sen

15:07

@ACuriousMind I think it's rude to show off that you're an expert at using umlauts while typing.

3

Anonymous

lol

Balarka Sen

I am personally hurt by it

Emilio Pisanty

@BalarkaSen let him be

Anonymous

Her 'o' key got damaged, maybe? :P

Emilio Pisanty

he's got a monster of a keyboard, most likely

Anonymous

15:09

Dunno how german keyboards are

Emilio Pisanty

@Blue monstruous

0celo7

@EmilioPisanty calling people trolls is not nice

Emilio Pisanty

Slereah

Emilio Pisanty

I'll direct your attention to the position of the Y

@Slereah Review of Gravity Control?

Slereah

15:11

It's a big book of studies on far fetched technologies

quite interesting, if a bit pessimistic

Emilio Pisanty

@Slereah it talks about negative energy density like they've got a bucket of it in the back yard

how is that pessimistic?

Balarka Sen

German keyboards are like the PC user's German Shepherd

People like to flex by showing that they got German keyboards

Slereah

Most reviews are basically "we either can't do it or the experimental results are negative"

You can tell this article is for engineering because they don't even bother with a metric

Damn engineers

0celo7

I take offense

Note that I am not flagging

Slereah

How can I trust that you do not

0celo7

15:17

But maybe we shouldn't star that, eh mods?

@Slereah I swear on Yvonne.

Semiclassical

@EmilioPisanty complexified quantum is the best quantum

0celo7

@EmilioPisanty what's a complex valued time?

Semiclassical

Useful, that’s what it is

Slereah

IIRC some GR also uses complex manifolds

Usually in quantum gravity sort of stuff

0celo7

@Slereah burn it with fire

Balarka Sen

15:23

@0celo7 maybe you complexify the tangent bundle or some shit

Semiclassical

Though the stuff I tended to do was less “complex time” and more complex trajectories

0celo7

@BalarkaSen no there are Lorentz-Kähler metrics.

Semiclassical

And that was more in the spirit of using cauchy’s theorem to write integrals as cycles on Riemann surface

0celo7

Tfw the dead guy is still in the GroupMe

Yikes

I guess they don't disable Facebook accounts?

Semiclassical

Huh?

Slereah

15:27

Can you rephrase that sentence

into an english sentence

ACuriousMind

What is a GroupMe?

@BalarkaSen Ö.

Emilio Pisanty

@0celo7 what it sounds like =P

Anonymous

@ACuriousMind It's a messaging app it seems

Anonymous

Like whatsapp

ACuriousMind

Why is there a bazillion messaging apps

This is getting out of hand

Anonymous

15:28

It's good business :P

Slereah

Capitalism

I still use IRC

Balarka Sen

gulag intensifies

ACuriousMind

I advocate monopoly on the messaging market because I don't want to have a dozen different apps on my phone just because my friends have oddly strong opinions on what apps they want to use :P

Semiclassical

I’d suggest someone make an app to manage all of those, but eventually other people would make such apps until we’re back where started

Slereah

Skype is probably the closest to a standard one

It's the one used by most businesses these days

Semiclassical

15:30

Yeah

Slereah

and old people

Emilio Pisanty

basically, you use some approximations to reduce your observable of interest to a time integral of the form $$a(p) = \int_{-\infty}^\infty F(p,t) e^{iI_pt+\frac i2 \int_{t_\mathrm{ref}}^t (p+A(\tau))^2\mathrm d\tau }\mathrm dt$$

Anonymous

I hate whatsapp but all my classmates are on it. So had to join. Resonate with ACM's feeling

Balarka Sen

@Semiclassical trillian.mit.edu/~jc/humor/Ms_fnd_in_a_Lbry.html

I don't have a zone so there is no need for a messaging app

phone

i can't type

Slereah

Fortunately, the charging one has been solved now that we've all standardized on mini-USB. Or is it micro-USB? Shit.

Emilio Pisanty

15:31

and then you deform your $t$ integration contour to pass through the saddle points of the exponent

ACuriousMind

Back in the day before smart phones it was the same circus with MSN, ICQ, etc.

Slereah

MSN, ICQ, AIM and Yahoo Messenger

And still IRC

Because IRC never dies

Anonymous

Then gmail happened

bolbteppa

"Weyl established the complete reducibility theorem for the special linear group - what he thought of as providing the group-theoretic foundation of the tensor calculus." Any idea why?

Balarka Sen

why do people still use messaging app?

the ZUCC chat does it all, doesn't it

ACuriousMind

15:33

@bolbteppa Because he was smart? oO

(I don't quite understand what your "why" refers to)

Anonymous

@BalarkaSen They still live in the 21st century. Unfortunately

ACuriousMind

@BalarkaSen the what now

bolbteppa

That too

Balarka Sen

ZUCC is 21st century

0celo7

@bolbteppa that sentence doesn't make sense to me

What does SL have to do with "tensor calculus"

Whatever that may be

Balarka Sen

15:34

@ACuriousMind ZUCC = Zuckerburg

bolbteppa

Why is Weyl's complete reducibility theorem "the group-theoretic foundation of the tensor calculus"

Slereah

I guess because it's a cover of $SO(3,1)$?

ACuriousMind

@BalarkaSen But...why?

Balarka Sen

i thought everyone uses facebook chat

Anonymous

Facebook chat is quite heavy

Anonymous

15:35

Whatsapp is lighter

Anonymous

But has other problems

0celo7

Facebook chat is an Indian thing, I think.

ACuriousMind

@BalarkaSen I think my friend group may be 20% Facebook chat, 20% WhatsApp, 40% Telegram, 10% Signal and 10% smoke signals :P

Semiclassical

@Slereah isn’t AIM down now?

0celo7

WhatsApp is European

Anonymous

15:36

@0celo7 Wut...

Emilio Pisanty

@BalarkaSen I thought everybody uses Signal?

Slereah

All the old messengers went down

0celo7

What the hell is signal

Balarka Sen

@ACuriousMind knowyourmeme.com/memes/zucked

Slereah

I thought everyone used Grindr

0celo7

15:36

Why don't you people just text?

Balarka Sen

@Slereah lmao

Emilio Pisanty

@0celo7 'cause it costs and the other alternatives don't

Semiclassical

@EmilioPisanty how much stuff have you seen re: complex saddle points vis a vis resurgence theory? I always wanted to know some of that

Emilio Pisanty

@Semiclassical what's resurgence theory?

Semiclassical

I’ll taje that as a no, then

Emilio Pisanty

15:37

@Semiclassical ;-)

Semiclassical

There’s a pertinent link, though

0celo7

@EmilioPisanty texting costs?

Emilio Pisanty

@0celo7 it does on my plan, anyway

0celo7

Are there phone plans without unlimited texting?

Semiclassical

The current KITP program is on resurgence theory

0celo7

15:38

And everyone uses iMessage anyway

ACuriousMind

@0celo7 Yes

0celo7

Huh

Must be a European thing

Semiclassical

kitp.ucsb.edu/activities/resurgent17

ACuriousMind

Quite common in Europe actually - no one wants unlimited texting anyway because they use messaging apps :P

Semiclassical

For the program summary

Anonymous

15:39

@0celo7 Nah, everyone doesn't use malware

Balarka Sen

@ACuriousMind You have an interesting community of friends

ACuriousMind

Ah, I also got one guy who only communicates via encrypted email :D

More an acquaintance than a friend, though

Semiclassical

@EmilioPisanty it’s been going two weeks now, with the second week being a conference with s lot of speakers

Balarka Sen

Beautiful

I should do that

0celo7

@Blue 75% of people use iPhones here

And the people who don't are usually pretty strange

Anonymous

15:43

@0celo7 Yeah, they're americans anyway

0celo7

@Blue Indians really have no grounds to make fun of other countries.

Anonymous

The same people who keep guns at their home

ACuriousMind

@0celo7 75% of people or 75% of people you know?

0celo7

@ACuriousMind 95% of people I know.

Maybe 90%.

Balarka Sen

americans are like indians but they don't do IT, eats more and wear stupid hats

or so an american told me

Semiclassical

15:46

A data point: macrumors.com/2017/04/20/iphone-ownership-all-time-high-us

0celo7

Well, maybe I should clarify. By "people I know" I mean people whose phone numbers I have.

Just looking around in class there's a lot of iphones. More than 43% percent

The prof has an iPhone too

Semiclassical

I suspect the demographic breakdown would be more illuminating

Emilio Pisanty

@Semiclassical so... what is resurgence, anyways?

Semiclassical

Near as I can tell, it’s analytic continuation on steroids

0celo7

Oh no

Semiclassical

15:52

The nLab page does a pretty good job for once: ncatlab.org/nlab/show/resurgence+theory

0celo7

Algebraic geometry?

Semiclassical

eh, nah

It’s more like “how do I use analytic continuation to make better sense of asymptotic series”

It gets pretty esoteric, though

0celo7

Ugh. I got an email from a prof who calls me by my first name but signs with his title. Jerk.

Slereah

Sorry @0celo7, you're just an Underling

0celo7

Maybe I want to be called Mr. Unger

Semiclassical

15:54

Ah, power dynamics

Slereah

Be glad he didn't go with Serf

Balarka Sen

tfw you are overdosing on indian cartoon shows

Semiclassical

Make it so, peon

0celo7

@Semiclassical doing fuel rod thermodynamics in heat transfer class right now. It's the exact same thing as my fluid mechanics homework

The equations are the same. Maybe it's some string theory duality at work

Thermodynamics/fluids duality

Semiclassical

Riight

Peon: a person held in compulsory servitude to a master for the working out of an indebtedness

See also: serf, indentured servant, grad student

@0celo7 wasn’t that historically a thing, actually? People thinking that heat was some ‘caloric fluid’ which could move between objects

Right, caloric theory: en.m.wikipedia.org/wiki/Caloric_theory

@0celo7 Are these steady-state equations?

Emilio Pisanty

16:05

0

Q: Fused Electrons Spin

If it was possible to make two electrons fuse, would it also be possible to increase the magnitude of that object's spin since it is not an elementary particle?

oh, boy

Semiclassical

Tbf, the triplet state of a two-electron system has spin 1

So the notion of combining electrons to get a larger spin is not that absurd

Anonymous

Not exactly "fuse", but Cooper pair is certainly possible.

Semiclassical

The issue is really how literally one should take the word fuse I guess

Anonymous

Literal fusion is not possible due to a variety of reasons, mainly electron-electron repulsion being a reason :P

Anonymous

I don't think the question is necessarily bad. Although I agree it lacks prior research

Semiclassical

16:11

Right. On the other hand, having two electrons interacting in such a way that they should be viewed as a combined system

That’s entirely reasonable

0celo7

@Semiclassical yeah

Emilio Pisanty

The Lava Lamps That Help Keep The Internet Secure

►

"this is not just some stunt", they say

Semiclassical

16:41

@0celo7 then that might explain it. once you drop the time-dependence from the eat equation, it's just Laplace's equation

0celo7

@Semiclassical yeah exactly

Semiclassical

kk

0celo7

It's string theory duality

Semiclassical

probably someone who knows transport theory could say something more generic

transport theory is one of those subjects that I couldn't sustain interest in

Anonymous

Any idea why $C_v$ and $C_p$ are called "response functions" (second derivative of thermodynamic potentials)?

Anonymous

16:46

I don't know why they use the word "response"

Anonymous

That sounds like some electrical engineering term

Semiclassical

something something linear response theory, probably

Anonymous

Yeah, but I don't know how specific heat is related to that thing...

Anonymous

Linear response function

A linear response function describes the input-output relationship of a signal transducer such as a radio turning electromagnetic waves into music or a neuron turning synaptic input into a response. Because of its many applications in information theory, physics and engineering there exist alternative names for specific linear response functions such as susceptibility, impulse response or impedance, see also transfer function. The concept of a Green's function or fundamental solution of an ordinary differential equation is closely related. == Mathematical definition == Denote the input of a system...

Anonymous

The second derivative thingy comes from $C_v=-T(\frac{\partial^2 F}{\partial T^2})_{V,N}$

Semiclassical

16:49

sure

Anonymous

Source...around 29:10

Semiclassical

for a textual source, see the first few sentences of these notes: bimanbagchi.com/courses/ss207/notes/Lecture_note_2.pdf

problem is, any response function should arise from how the system couples to an external field

and i"m not sure what the external field is in the case of the specific heat

(probably the temperature of the reservoir?)

hmm, this source mentions the following

"[Per the proceeding calculation,] we connect the heat capacity, i.e. the response to an energy perturbation, to the energy fluctuations."

0celo7

17:04

@BalarkaSen r/iamverysmart misses me off sometimes. Does that mean I'm one of their victims?

Semiclassical

so heat capacity in that case is understood as how the system responds to an 'energy perturbation'...whatever that's supposed to mean

Balarka Sen

@0celo7 maybe you are very smart

Slereah

I are very smart

Anonymous

@Semiclassical Interesting! I'm reading through the documents

Semiclassical

though I guess it makes sense. if I want to increase the system's temperature by delta T, how much internal energy delta U do I need to add? the ratio (delta U)/(delta T) is then just the (average) heat capacity

Sid

17:07

The new google assistant is pretty cool.

Balarka Sen

my favorite reddit is r/vaporwaveaesthetics

0celo7

Maybe, but the comments just piss me off

Slereah

well reddit people are awful

Balarka Sen

it's like legal 4chan

0celo7

You can't even criticize them without becoming a victim

They seem to think everyone is a complete moron and no one understands math beyond calculus or physics beyond 1r^2

Balarka Sen

17:12

well

thats kinda the point of that reddit

0celo7

@BalarkaSen do you go on /sci/

It's a bunch of smart asses trolling. You'd like it

Balarka Sen

i shall check it out

0celo7

Mostly algebraists

Anonymous

@Semiclassical Yeah, I think it means that. Found two more relevant sources: 1 and 2

John Rennie

My inner tube just burst.

Emilio Pisanty

17:15

@JohnRennie did some troll just make you lose your patience?

was somebody Wrong On The Internet and you just lost it trying to argue with them?

0celo7

@JohnRennie is that a euphemism for an intestine??

Semiclassical

@Blue ya

John Rennie

@EmilioPisanty not my inner tube - I don't have an inner tube. I'm kept in shape by a skeleton rather than hydraulic pressure (most of me that is). My bicycle's inner tube just burst.

Anonymous

@JohnRennie I was going to advise you to visit a doc's clinic. But my new advice would be to take your bicycle to the hospital (emergency ward) :)

Emilio Pisanty

@JohnRennie so... the most boring interpretation then

oh well =(

Semiclassical

17:18

@Blue and of course the fact that one can either consider Cp or Cv reflects the fact that one can either add energy with pressure held fixed or volume held fixed

John Rennie

@EmilioPisanty 'Fraid so.

It was a long walk home.

Semiclassical

@JohnRennie BOOOOOORING

but yeah, that sucks

Emilio Pisanty

@JohnRennie I guess it's better than the options that had you requiring intestinal surgery

0celo7

This is why America invented cars

Semiclassical

a few weeks ago I was transporting my bike via public transit so that I could bike home

John Rennie

17:19

But the good news is that I have procured a brand new inner tube for three of Her Majesty's finest pounds. And tomorrow I shall fit it.

Semiclassical

and on the way I noticed that my tire was leaking

Anonymous

@0celo7 As if. What were the Germans doing? :P

0celo7

@Blue making a motorized cart

Loong

@0celo7 Karl Benz was American?

Emilio Pisanty

@JohnRennie how's the pound doing nowadays?

Semiclassical

17:20

on the way home I did manage to stop by a gas station and use their air pump to get enough pressure so that I could bike home

0celo7

@Loong no

Anonymous

@0celo7 Google Karl Benz

0celo7

Never heard of him

I don't care for your revisionist history

Anonymous

...

Semiclassical

Mercedes-Benz?

John Rennie

17:20

@EmilioPisanty better last time I looked. The UK economy is actually not doing too badly all thighs considered.

0celo7

Many Americans consider Henry Ford the invented of the automobile. It's my patriotic duty to consider that the correct history. Karl Benz made a motorized cart, not an automobile.

Emilio Pisanty

@JohnRennie the UK economy does seem to be pivoting towards a higher support in the thigh sector

John Rennie

Oops :-)

Emilio Pisanty

is there a Brexit strategy already, then?

Anonymous

@0celo7 Ford just stole Benz's idea and improved it ;)

John Rennie

17:23

And it's too late to edit the post. Oh well. There is some merit to considering thighs I suppose :-)

0celo7

@Blue "steal" is a strong word here :P

John Rennie

@EmilioPisanty I strongly suspect the real plan is a hard brexit but they want to make it look as if the EU is to blame.

Semiclassical

oof

John Rennie

That way the right wing faction of the Conservatives get their way plus they get to blame the EU for the resulting economic damage.

Semiclassical

That sorta seems like a sword of damocles hanging over the economy

Emilio Pisanty

17:24

@JohnRennie yeah, that's a rather plausible interpretation of Her Majesty's Government's behaviour, I guess

0celo7

That seems like a pretty good strategy for them

Semiclassical

it seems like a cunning strategy, I'll grant that

Emilio Pisanty

@JohnRennie or so they think

Semiclassical

but, well, that snap election which May called in the spring also seemed like a cunning strategy

John Rennie

@EmilioPisanty well, they will blame the EU. It's just a question of whether they can convince anyone else ...

0celo7

17:25

The people who hate them will not believe their stories and the people who like them hate the EU

Emilio Pisanty

@JohnRennie are they still trying to convince people that the EU needs the UK more than the UK needs the EU?

John Rennie

@EmilioPisanty I have taken to actively avoiding any news that discusses the issue. Possibly I'm unnecessarily emulating an ostrich by doing so, but I have my mental health to consider - it's all just too depressing.

Semiclassical

"You can fool all the people part of the time, or you can fool some people all the time, but you cannot fool all people all the time."

John Rennie

@Semiclassical pompous and incorrect.

Emilio Pisanty

@JohnRennie that's a rational strategy

ostriches never do see the predators coming

they have a perfectly pleasant time of it

John Rennie

17:28

@Semiclassical Just figure out what people want to believe and tell them that. It works every time.

Emilio Pisanty

up until they're run over, that is

Semiclassical

people like to attribute that to Lincoln (but people like to attribute a lot of things to Lincoln which he isn't known to have actually said)

Sid

@Semiclassical May had become overconfident. That's the only reason they had a poorer result

ACuriousMind

PSA: Ostriches do not actually bury their heads in the sand to avoid predators. If you do so, you're literally less rational than an ostrich ;P

Emilio Pisanty

Semiclassical

17:31

my knowledge of British electoral politics is pretty much entirely second-hand, so i don't put too much stock in it

plus, American electoral politics take up enough of my headspace; i don't need more

Emilio Pisanty

@Semiclassical if you put too much stock in it, it will be too salty

Sid

@0celo7 You Americans cost me a nice Rs. 3k prize because of that exact thing

Anonymous

@Sid Won some quiz?

Sid

Long story- I with a couple of others participated in a Quiz in our college fest. One of the questions was, "Who invented the first practical motorcar?" - Now, the other two people were clueless. So, I began to brainstorm and realized that Ford is considered to be the inventor of automobiles by the Americans and so I answered Ford which was incorrect

If only the Americans had the right history lessons, I would have won that tournament.

Prathyush Poduval

I lost 5k coz i forgot tollens reagent

Anonymous

17:37

Lol. Don't trust american history

Balarka Sen

@ACuriousMind Some solid Ostrich facts by Vsauce Michael there

Anonymous

@PrathyushPoduval Wtf...what type of quiz is that

Prathyush Poduval

well the question was, what is used in the silvering of mirror, gave a bunch of options....... since it was a rapid fire we couldnt get it in the heat of the moment\

ended up second instead of first

but still got 10k

Anonymous

@PrathyushPoduval Yeah, but what quiz was that? Where was it held I never heard quiz competitions paying such large amounts

0celo7

wtf are you people talking about

Prathyush Poduval

17:40

@Blue it was a quiz held in a college nearby. Even I was surprised by the huge amount and immediately signed up for it

Anonymous

Wow. I should keep an eye open for such things

Prathyush Poduval

i go wherever there's money, people are giving away huge amounts of money here

Sid

@0celo7 How you people are costing us money. :P

@Blue You should. College is an excellent time to earn money without really working your ass off. :P

0celo7

@BalarkaSen last night's Curb episode had me in tears

you have to watch that show

Balarka Sen

I have been contemplating that

John Rennie

17:46

@PrathyushPoduval I remember doing that at school. I think most oxidising agents will work.

0celo7

Curb Your Enthusiasm - Larry has to change in front of saleswoman

►

John Rennie

@0celo7 I finally got around to watching the film Logan. I might have had moist eyes and a lump in my throat at the ending - in gruff and manly way of course.

0celo7

@JohnRennie no, this was tears of laughter

I cri evrytme I watch Shawshank tho

John Rennie

Ah :-)

Balarka Sen

Shawshank is a good movie

John Rennie

17:50

@0celo7 have you read the book?

0celo7

no

how is one supposed to have time for fiction books

John Rennie

The film is pretty faithful to the book, but I think the book is deeper.

Likewise The Green Mile.

Balarka Sen

@JohnRennie The original comics is painful to read

Anonymous

@0celo7 Some people I know can read up 500 page novels in a few hours (I wonder how they manage to...)

John Rennie

@BalarkaSen I've never read the Marvel comics. There must be thousands of issues involving Wolverine. Does he eventually in the same way in the comics?

Balarka Sen

17:52

namely, "Death of Wolverine"

0celo7

@Blue I'm mentally challenged

I can't do that

Anonymous

@0celo7 Same here

0celo7

I read abut 5 pages an hour

Balarka Sen

the movie was only loosely based off of that comic though

0celo7

Curb Your Enthusiasm - Larry gets annoyed by crying woman (Fatwa funeral)

►

@BalarkaSen this stuff is amazing

John Rennie

17:54

@BalarkaSen aha:

Death of Wolverine

"Death of Wolverine" is a 2014 comic book storyline published by Marvel Comics. The story has grown from both volume 5 (Marvel Now!) and volume 6 (All-New Marvel Now!) of the Wolverine main series. == Premise == The start of the storyline (Wolverine vol. 5 #5) details how a virus from the microverse caused Wolverine's mutant healing factor to burn out and stop working, allowing enemies from his past to attempt to finally kill him. The main series is followed by a number of aftermath mini series that chronicle Wolverine's friends and family as they come to terms with the death of Logan. These series...

0celo7

I wish I could be like Larry

500 mil in the bank, no hecks given

Balarka Sen

@0celo7 lmao

John Rennie

this is an extra credit question that I really want to answer because I have to have a good grade in this class

Anonymous

someone even upvoted that?

Anonymous

What's the earth coming to

0celo7

17:57

@Semiclassical Just saw your caloric comment

@Semiclassical wonder if people were inspired by the similarity of the equations

Semiclassical

probably the other way around, tbh

0celo7

and they just thought the nonlinear term was very suppressed for heat

@Semiclassical didn't we understand fluids before heat?

Semiclassical

the similarity of the phenomena in certain circumstances led them to write down similar equations

0celo7

or at least before the nature of heat

(I sound like Duffield now)

Sid

I always have believed that extra-credit questions are scams.

Semiclassical

17:58

depends on what we mean by 'understanding fluids', I suspect

but it's an interesting historical question

Balarka Sen

@JohnRennie There are a lot of Marvel and DC comics which are really good. If you are not repulsed by the comic book culture and men in tight suits flying around, check out "Batman: Black and White". That's a four volume collection of acclaimed writers writing short, really painful Batman stories.

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