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00:00 - 18:0018:00 - 00:00

00:01
Yep, reducing the entropy of the site one question at a time.
@vzn Thanks. It's not really my work though. My contribution is all in infrastructural work.
Shankar is out with a QFT book now I guess?
vzn
vzn
@DanielSank so are you guys getting into some kind of fabrication?
@vzn Uh, yes, we do fabrication. Qubit chips don't grow on trees :-)
vzn
vzn
@DanielSank is that in silicon? youre planning a lot of qubits by end of yr?
00:15
@vzn The materials we use as substrates are described in a variety of papers.
Silicon and sapphire are the most common.
vzn
vzn
while this is not wrong by conventional understanding, think it is questionable on abstract grounds.
> Since every state is equally important, it is not possible to simplify the prob- lem, using a smaller truncated state-space. The complexity is then simply given by asking how much classical mem- ory does it take to store the state-vector.
> Storing the state of a 46-qubit system takes nearly a petabyte of memory and is at the limit of the most powerful computers [14, 15]. Sampling from the output probabilities of such a system would therefore constitute a clear demonstration of quan- tum supremacy.
hello
@ACuriousMind you around?
 
4 hours later…
04:16
@Blue Even you too? lol :P
Anonymous
04:30
@PrathyushPoduval There's a lol overload in this chat
Anonymous
I'm looking for alternatives
@Flynn I still read New Scientist mainly for the news. I agree with you that the feature articles are generally not very good these days. I also read Scientific American though that's only monthly and it too seems to be headed down the same route as New Scientist.
I don't know of any print magazine that fills the niche abandoned by New Scientist. Reading web sites somehow doesn't feel the same.
05:04
@Blue 100 keks to you!
@BalarkaSen You watche'd the movies and/or read the comics?
 
2 hours later…
06:56
in Mathematics, 25 mins ago, by Leaky Nun
Must column ranks and row ranks be equal for infinite-dimensional matrices?
 
1 hour later…
08:11
@Blue Lol why so serious? lol
@Avantgarde kek's are the new trend, not lol, lol
Sid
Sid
Nah, lol is better than kek
Sid
Sid
@user685252 that would be a typo of lol
08:26
@user685252 sounds like something else......
cock (I am talking 'bout the animal, in case some of you think something else...)
a doodle do
scooby dooby do, a do doodle do
@PrathyushPoduval The movies yeah
08:30
nice
you keep yourelf up to date?
pop culture is the staple food of a good memer
RIP Raging Bull <---best movie ever
@BalarkaSen do you even make memes?
@PrathyushPoduval Did you mean
That^ should be "over 9,000 keks".
08:35
@PrathyushPoduval Sometimes.
memes build on each other
@BalarkaSen yup , a thousand keks to you !!
@BalarkaSen show you're creations
One day I walked into a room (virtual) and it was "lit" everywhere
That's when I found out that a new trend had begun
@PrathyushPoduval My memes are contextual, so they are not really one-image material
Even when I go back a few years and look at my messages, I discover dat I used to typ lyk dis. It was horrific to witness
08:48
If you stick around maybe I'll make one someday in some context
@Avantgarde lol
Thankfully changed for the better, I hope.
Or maybe I've just grown old
you just recovered from cancer, that's all
There are way too many cancerous trends that goes on in popular culture and leaks into the internet culture.
@BalarkaSen ah okay
@Avantgarde if it makes you feel better, soon you'll die
09:06
oooh another clickbait
If that's clickbait I am a jellyfish
my first reaction to the title is "nope"
i should do some math now instead of shitposting
do you do anything else other than things starting with m?
@BalarkaSen yes. Good to be here
10:04
-1
Q: Physics, Chemistry, Biology are so AGRESSIVE :(

Terib I have a question about my Physics Stack Exchange post: Calcuation Stress Force Why can't i ask my questions here? There's some agressive moderators and others more. I mean Biology, Chemistry, Physics are really agressive. So I'm looking for new forums which i can share my questions easily....

 
2 hours later…
11:39
I just slept for 12 hours
Anonymous
@Avantgarde My school friends used to mock me for NOT writing lyk dat :'D
@Blue Indians kek
@Blue you think that meta post above is one of your ppl?
Anonymous
Writing well is apparently not cool among school and college kids
@Blue it is an interesting cultural phenomenon
Anonymous
@0ßelö7 High chance
11:49
Is it a part of a "fuck the system" mentality?
Doubtful (heh) because Indians seem very education-driven.
Anonymous
@0ßelö7 Lòoooooooooooooool.....they are only marks and money driven
@Blue Are they driven by grades because of the money?
@0ßelö7 Nah.
hello
They bitch about the system but do not dare to fuck the system.
Hi liquid 0celot
Anonymous
11:58
@0ßelö7 In school they are driven to get grades because of the very highly competitive education system over here. Parents scold their kids if the neighbour kid gets better grades. In college , most students only care about getting a good placement right after their UG...hence the rush for grades. Most people don't give a flying f*** about research or studying for gaining knowledge.
2
@ACuriousMind @BalarkaSen There's a really confused physics student in my finite gp rep th class. He self-identifies as an analyst, thinks finite gp rep th is fundamental in physics, doesn't know what Hom means, and wants to work on string theory.
Specifically, he didn't know what the algebraic dual of a vector space was.
He did know what the topological dual was, which left us very confused.
oh well
whatever floats his boat though
Anonymous
@BalarkaSen I think some things are out of their control. You can't do anything if your family doesn't allow to take up streams which you like.
Anonymous
But yes. I partially agree with you
@Blue Sure, I didn't really mean a violent arms revolution overthrowing the education system. But if you feel trapped by the way education works, you can pull yourself out of it. For example, I think what is a more important issue than parents not encouraging their kids to take up the streams they like is the students having 0 idea what kind of things they actually like.
12:04
@BalarkaSen What's even stranger is that I think he did a reading course of Milnor-Stasheff with my advisor. How can you make it through that book without learning what Hom means
Oh, that is strange.
And my advisor has a good BS detector, he would know if the guy was faking it
Anonymous
@BalarkaSen Okay, I agree with that :P "0 idea" part is true. I found very very few people with an ambition/passion over here (other than the passion for getting a job at Google, Facebook,...)
@Blue Right, most students have a (economical slash social) status-based half assed idea about education.
That's not what it is bruh
The first step towards "fucking the system" is to stop being clueless :P
@b
ok I need a key logger
I did NOT hit enter there
something is up with my tab button
12:08
the tab button is dabbing at you
the dab button
ooooooooooooooooooooooooooo
you have a dab button?
remind me, what is the algebraic dual of a vector space, as opposed to the topological dual?
@BenNiehoff linear functions vs. continuous linear functions
but the space was finite dimensional!
so he didn't even know 1st semester Banach space stuff
hmm...I guess for the most part I only care about continuous linear functions
@BenNiehoff No, you don't
I highly doubt you ever actually work on infinite dimensional spaces
12:15
where do the discontinuous ones show up, aside from as a nifty counterexample?
no, I stick with 11 dimensions or less
@BenNiehoff every infinite dimensional space has one, typically
no, 32 dimensions or less ;)
on a finite dimensional space, they are all continuous
ah, I think the counterexamples I'm thinking of are only linear over Q
wot
who does linear algebra over Q?
12:17
by which I mean, f(ax) = af(x), for a in Q
R, C, or bust
ah, but you can come up with wonky functions which satisfy that and are nowhere continuous
for x in R
that's kinda necessary
@BenNiehoff Yes but that's not what linear means.
@Blue Damn, they must be so cool
If $f(ax)=af(x)$ and $f(x+y)=f(x)+f(y)$ for any $x,y\in\Bbb R^n$ and $a\in\Bbb R$, then $f:\Bbb R^n\to\Bbb R^k$ is continuous.
12:20
but this fails in infinite dimensions
is that your point?
@BenNiehoff Yeah
That's not to say the discontinuous ones are uninteresting, in fact they are quite intriguing and important
A second course on functional analysis looks at discontinuous linear functionals
I'm also a bit mystified how someone would get the idea that finite group representations are the secret to physics
although there are certainly some interesting connections with this monstrous moonshine stuff
@BenNiehoff The professor keeps saying it too!
He's one of my favorite people so I don't have the heart (or balls because he's a famous guy who can write my recommendations) to tell him he's wrong
@BenNiehoff yeah but that's hardly fundamental, but I'm no string theorist...
is it an older famous guy?
yeah
12:27
I know a few of those who have some pretty weird ideas lately
nah he's not like that SMBC comic
hopefully someday I'll be famous enough that I can go full crackpot
it'll be great
I just don't think he's paid attention to physics much but heard that from someone and ran with it
...as a justification for his course on module theory
@BalarkaSen I think Springer printed my book at 150% size i.gyazo.com/1c1afcce34bfe77f332173ebbf0863a9.jpg
from my point of view, Lie groups are way more important, but I'm not sure what qualifies as "fundamental"
@BenNiehoff Yep, and the theory of finite groups is completely different.
12:35
So I picked up Lego Worlds a few days ago, it's a lot of fun
12:46
so now it's an experimentally proven fact that melons bleed
lmao
13:16
@BenNiehoff I'm not saying they're the secret to physics (although for all I know, they could be), but it's surprising how useful they are
Anonymous
Does an atom (as a whole) have any spin? Are spins of elementary particles (neutrons/protons/electrons) additive?
@Blue they are additive in a sense, see www2.ph.ed.ac.uk/~ldeldebb/docs/QM/lect15.pdf
Anonymous
@0ßelö7 I see. Thanks!
13:31
@b
wtf
it keeps doing it
@Blue I think this is important in baryon physics, where one can distinguish various "seemingly identical" quark combinations by their total angular momentum
for instance, the $\Delta$ has the same quarks as a proton, but a different spin
Anonymous
@0ßelö7 Exactly...I was reading about distinguishing between identical particles using their angular momentum. By the way, I was a bit confused what they mean by "distinguishable" and "indistinguishable" in the context of statistical mechanics. It seems even among identical species, unless we can measure the location of a particle accurately (like in classical mechanics), they will be termed as "indistinguishable".
Anonymous
Apparently they assume He atoms at low temperature to be indistinguishable. I'm not sure why.
Anonymous
I didn't find any specific limit, which helps to determine if a particle (atom/molecule) follows classical laws or not.
Anonymous
I think bigger molecules can be distinguished by position (or at least assumed to be)....and that's why we apply Maxwell-Boltzmann statistics for them.
Anonymous
@ACuriousMind Were you able to clear your confusion regarding that ensemble derivation thing?
Anonymous
14:02
Anonymous
How are these two sites different? ^
Anonymous
They seem to have largely overlapping scope
cstheory is the sort of math overflow to cs (math)
Anonymous
@heather I see. Each of those are low-traffic sites. I wonder if it was a good idea to split that.
Anonymous
14:06
My question on CS SE went unanswered...perhaps I should ask it on CS Theory
what was your question?
and probably not; crossposting is discouraged regardless of site.
Anonymous
@heather This
Anonymous
@heather I'll delete and re-ask
Anonymous
Discouraging cross-posting is silly imo....SE has so many overlapping sites
Anonymous
Especially for CS and programming
14:09
> It's surprisingly hard to find a proof you're looking for. Knuth has a pretty clear one in TAOCP, v.3.
It seems you already have a (partial) answer...
let me look it up
Anonymous
14:20
That book is on libgen but it's a pain to search in that book.
Anonymous
I'll have a go at it again...sometime soon
14:45
@Blue Not yet, but I haven't gotten around to writing it into a coherent question, either
@0ßelö7 Finite groups do appear in condensed matter a lot
Quick question. When people in non-North American countries describe how heavy something feels, do they usually state its mass or weight?
@SirCumference kg/g in india
@SirCumference Mass (in Germany and as far as I know the rest of Europe)
Huh. Here in the US most people don't even know what our unit of mass is
Although the UK might deviate
14:54
We talk exclusively in pounds
@SirCumference Isn't it pound?
ah okay
Anonymous
@SirCumference Most people don't even know the difference. :P
Is there any country which uses weight (Kg.wt or newton seems like a wierd unit)
@PrathyushPoduval I genuinely have no idea. I've heard ours is called a "slug" and that "pounds" is a unit of force. But I've never once heard anyone say "slug"
@SirCumference the pound is both a unit of mass and a unit of force
14:56
@ACuriousMind I've also heard that...
Or rather, there are two units, one for mass and one for force that are confusingly named the same :P
Anonymous
The gravitational metric system (original French term Système des Méchaniciens) is a non-standard system of units, which does not comply with the International System of Units (SI). It is built on the three base quantities length, time and force with base units metre, second and kilopond respectively. Internationally used abbreviations of the system are MKpS, MKfS or MKS (from French mètre–kilogramme-poids–seconde or mètre–kilogramme-force–seconde). However, the abbreviation MKS is also used for the MKS system of units, which, like the SI, uses mass in kilogram as a base unit. == Disadvantages... ==
The slug is a derived unit of mass in the weight-based system of measures, most notably within the British Imperial measurement system and in the United States customary measures system. Systems of measure either define mass and derive weights or define a base weight and derive a mass unit. A slug is defined as the mass that is accelerated by 1 ft/s2 when a force of one pound (lbf) is exerted on it. 1 slug = 1 lbf â‹… ...
No idea what this is then
seems like slug(mass) is in terms of pounds (force)
and there is another pound(mass)
A modern shotgun slug is a heavy projectile made of lead, copper, or other material and fired from a shotgun. Slugs are designed for hunting large game, self-defense, and other uses. The first effective modern shotgun slug was introduced by Wilhelm Brenneke in 1898, and his design remains in use today. Most shotgun slugs are designed to be fired through a cylinder bore or improved cylinder choke, rifled choke tubes, or fully rifled bores. Slugs differ from round-ball lead projectiles in that they are stabilized in some manner. In the early development of firearms, smooth-bored barrels were not...
14:58
God this crap is confusing. Back in classical mechanics, anyone who gave a non-metric answer would be laughed at
Our prof explained it was because we are a "backwards third-world country"
@PrathyushPoduval Now, what's interesting is that back in the day, we would get some questions saying "An object weighs 50 Newtons"
@SirCumference I had a lbm vs slug question on my heat transfer exam and it'll probably be the most missed question
> NASA lost a $125 million Mars orbiter because a Lockheed Martin engineering team used English units of measurement while the agency's team used the more conventional metric system for a key spacecraft operation
@SirCumference yeah, we did use to get those in school. Moreover, the mass-weight thing used to be a very bad trick question
@0ßelö7 Which is our unit of mass?
15:01
@SirCumference you should ask him why he doesn't move somewhere else
@SirCumference slug
Pound mass is the unit such that 1 lbm gives 1 ft/s^2 of acceleration due to gravity
You need to take some engineering classes
There are wonderful units like W/ft or inches of water
@0ßelö7 Bah, I'm not planning on being some applied physicist
Oh, just jobless.
7
Ok
Nvm then
Ok fair...
vzn
vzn
@Blue (lately interested in this also.) wikipedia has a fairly thorough writeup. (in)distinguishability very much relates to QM measurement. iiuc its almost defined as whether you can measure them as distinguishable or not.
Anonymous
That was smooth =P
15:04
I guess I'll look into some
vzn
vzn
Identical particles, also called indistinguishable or indiscernible particles, are particles that cannot be distinguished from one another, even in principle. Species of identical particles include, but are not limited to elementary particles such as electrons, composite subatomic particles such as atomic nuclei, as well as atoms and molecules. Quasiparticles also behave in this way. Although all known indistinguishable particles are "tiny", there is no exhaustive list of all possible sorts of particles nor a clear-cut limit of applicability, as explored in quantum statistics. There are two main...
The reality is that some people think that feet of water is a legitimate unit of pressure and you have to deal with that
@0ßelö7 What...?
Anonymous
@vzn Yes, I read that up sometime back. I get it now, more or less.
@ACuriousMind Is steam acting strange for you right now?
15:06
@0ßelö7 Strange how?
Like it keeps telling me I have no internet connection, then when I try downloading something it randomly stops or gets very slow. My actual connection is fine.
When I restart the download it seems to get fixed for a few minutes
@Blue I think it is better to think about this as them being classical. You apply M-B statistics for classical gases and F-D or E-B for quantum ones. Distinguishability seems to me to be sort of a red herring.
Or not
Steam behaves normally for me
I need a new PC.
Anonymous
15:08
@ACuriousMind "Classical" by definition implies "distinguishability" I suppose ? There's no HUP there.
@Blue What has the HUP to do with distinguishability?
Two particles are distinguishable if you can distinguish the state where particle 1 is in state A and particle 2 is in state B from the state where particle 1 is in state B and particle 2 is in state A. Otherwise they are indistinguishable.
Sid
Sid
@0ßelö7 your PC is messed up, pal
Anonymous
In classical mechanics we can distinguish particles by position which is not possible in quantum mechanics. That's what I meant. " As long as the position of each particle can be measured with infinite precision (even when the particles collide), then there would be no ambiguity about which particle is which."
@Blue Well, you can also quantum mechanically measure the position of each particle with arbitrary precision.
Distinguishability is just what I said above, it doesn't really have to do with classical or quantum or with position, except in so far that quantum many-body states are naturally indistinguishable due to the way they are built from bosonic or fermionic creation/annihilation operators.
Anonymous
@ACuriousMind I see. I'll have to read more about this thing. Thanks though
15:24
@Sid I'm going to light it on fire
Sid
Sid
@0ßelö7 that would overheat it. :P
@BalarkaSen interesting (perhaps still open) problem: do the exotic spheres admit metrics of positive curvature
Certainly not positive constant curvature, else they wouldn't be exotic...
16:14
@0ßelö7 Beautiful question. I have no idea; ask Mike
16:31
Hopefully quick question: I've got a secondary supervisor, who's an associate professor in America, for my PhD. In my first e-mail to him, should I be more formal or informal? Here (UK) I'd say more formal for the first e-mail, then informal after, but USA could be very different...
@Mithrandir24601 what does formal mean to you?
Anonymous
@Mithrandir24601 Perhaps it depends on what you mean by informal...
Don't pull a Germany and call him by his 7 titles
Anonymous
Based on my experience of mailing a 100 professors in 3 days' time I'd say a polite formal tone is better. They might creep out if you talk to them like you would talk to a friend. :P
Why would you email 100 professors??
Anonymous
16:35
@0ßelö7 For research internship...lol
Why email? It's much easier to deny you via email
Anonymous
About 10 out of the 100 responded
Go in person and look especially skinny
@Blue You might want to read this academia.SE post.
Anonymous
@ACuriousMind Oh, I read that
Anonymous
16:36
I didn't spam
Anonymous
I mailed only once
Lmao
Anonymous
And all of them were Indian professors
@Blue is a stereotypical Indian spammer :'D
Anonymous
@0ßelö7 kek...well, at least my mission was accomplished
Anonymous
16:37
:P
Anonymous
I've made good relations with the profs who replied
@Blue Shotgunning 100 people with a mail in the hope that at least one replies does sound like very traditional spam to me, tbh.
Anonymous
@ACuriousMind Oh, and thank god I'm not from an Indian Institute of Technology
@ACuriousMind that's what I said
My phone is acting very strangely
Anonymous
@ACuriousMind True. But none of my mails were unrelated to the field in which the professor were working. I spent a lot of time on that. It's not like I mailed an astronomer about "solid-state" research.
Anonymous
16:41
Professors get annoyed only if the emails are un-related to their field of work.
@ACuriousMind Do you understand conformal mapping?
(Complex analysis)
@0ßelö7 Depends on what you mean by "understand"
I think I need to map the exterior of an ellipse to a disk
Something something $z + 1/z$
@BalarkaSen that maps the disk to a plate...maybe z+k/z will stretch it
16:48
Yeah
Oh wait, it maps the disk to the inside of the ellipse, right?
You want the other way around?
Just take the holomorphic inverse
Yeah I might need the inverse
Gotta draw some damn pictures. Ugh
@BalarkaSen no I need az+b/z
z+a^2/z takes the exterior of the disk of radius a in the uhp to the uhp
So I'm thinking if I modify both terms I can adjust the major and semi major axes
@0ßelö7 @Blue formal would be more "dear ..." and would include phrases more like "is there any particular date that would be convenient to you" while informal would be more "hi," and contain phrases like "when would suit you"
My first advice is to avoid the Nigerian Prince @Blue's advice...
Anonymous
17:02
My advice would be to go with the first option. But as @0ßelö7 says, don't take my advice blindly. :'D
@0ßelö7 What if his advice is to ignore your advice?
Aw, it's not - that would have been so fun
Anonymous
I did mail a couple of American professors at UW Washington. They did reply to me quite fast. (I had used a formal tone...like you mentioned)
The fact that he said mail and not email is a flag
I think he's a bot
Anonymous
@0ßelö7 I can transform into a bot in times of crisis ;)
Anonymous
@Mithrandir24601 No one takes his advice seriously anyway. So I didn't mention it. :P
17:08
My advice was to not spam. If that's not good advice, delete my account.
@BalarkaSen ew, this algebra isn't working. Maybe I should transform the elliptical disk into a circular one, then compose with z+1/z
rob
rob
salutations, all
I felt like next time when vzn is on, I might be asking him an actual theoretical computer science question
as currently I am trying to construct all ordinals between $\omega_1^{CK}$ and $\omega_2^{CK}$
but the issue is that there are uncomputable ordinals and I know nothing about turing machines to make sense of them
@rob greetings, Earthling
If you're not from earth we have an issue @Mithrandir24601
Anonymous
17:23
I'm done with earthlings. I'd like to meet some extra-terrestrials now.
first keks, now earthlings...... what has become of this place?
@Blue "The best proof of extraterrestrial intelligence is that they haven't contacted us." - Bill Watterson
independence day should actually happen
@ACuriousMind so edgy
@0ßelö7 ¯_(ツ)_/¯
17:29
earthlings are "boring"
but aliens will melt your brain
00:00 - 18:0018:00 - 00:00

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