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12:00 AM
not yet, i am working on a draft
i hope to finish it this weekend.
 
ok
I was getting impatient ;)
take your time
Anna says you should visit an observatory so you can see the true science you should be interested in.
Anna is jealous that you like quantum computing.
Mwa hahahaha
"I don't mean it. It's not true. I think what you do is really cool". <-- another quote from Anna.
 
who is Anna?
@DanielSank lol
astronomy and astrophysics are both interesting subjects, but i must admit i believe quantum computing is much better.
 
12:20 AM
@heather My SO.
 
About whether we are living in a simulation, I recall I once talked to Howard about it and he suspects a nice support that our world is not a simulation is if we can find a physical phenomenon that is uncomputable. The existence of such phenomenon will then convince us that we are not in a simulation
However the more I think about it, the more it seems there is a catch: what if being in a simulation or not has nothing to do with computing power, then such thing will still not be a conclusive test
I need to check whether in QFT there are operations that can transform one type of quantum field into another
The 2014 sci-fi movie Predestination makes me wonder whether a time traveler is no better at the knowledge about the future compared to a none time traveler. For example, a time traveler will often think he or she is at their own present hence they
they had free will to decide their future. But what they don't know yet is that they might be still part of a predestination paradox in the next couple of minutes
I think I need to check again how exactly systems with memory operates in CTC (yes, what I said above will hold in type 1 time travel, but will fail for type 3 and 4)
 
12:40 AM
@DanielSank superior officer?
 
^ Close enough.
As the old saw would have it "when we disagree we talk it out, explain our differing points of view, then we both compromise and do it her way"
2
 
 
2 hours later…
3:08 AM
@dmckee basically what I told my grad student today.
with your SO sometimes you loose, and the rest of the time you loose also.
 
3:46 AM
Fun fact: Most of the time, people don't know what I am investigating when I started to post a stream of maths. Interestingly however, they almost always able to give relevant comments and answers
It's as if we all know what we are doing without having a clue on what we are doing
 
 
4 hours later…
8:15 AM
So it turns out the proof of the simple connectedness of $R^n$ is fairly simple
 
Hey! Anyone here (or could you perhaps recommend someone I could write at) who has experience with modeling semiconductor surfaces? Or well, how to accurately include them in a finite element model? I'm working on nanowires, where the surface to volume ratio is very large and one definitely needs to do something with that
 
\o @yuggib
 
O/
 
How's it going?
 
@Secret you can't find uncomputable phenomenon per Craig's theorem and also there's no such thing as uncomputable, things are only uncomputable wrt a computation model
Ie a Turing machine
An uncomputable problem will be computable in a morepowerful model
 
8:26 AM
hey guys how u doing here!!
 
Fine thanks, how are you?
 
So ,I am going to post a simple chemistry question,if anybody has experience on chemical kinetics please answer this question ,, posting below:;
@Everybody For the first order reaction A---->B+C ,the carried out at 27°C,if 3.8*10^(-16)% of the molecules are in activated state Find Ea.
 
@satyatech do you know the connection between the probability of being in the excited state and the activation energy?
 
I only know that those molecules who are in excited state are going to do the reaction.But as I don't know k, and Arrhenius factor I can't find Ea.
k is a constant but I am not given ' t' ,so how to find k ? As ln([A]o/[A]t) =kt
 
You don't need the rate constant or pre-exponential factor. The question just tells you that some proportion X of the molecules have an energy $E_a$. You just need the equation for the probability of finding a system some energy $E_a$ above the ground state.
 
8:35 AM
Is this for JEE? @satyatech
 
Ya
Sir @JohnRennie could not understand your third line.
 
In statistical mechanics and mathematics, a Boltzmann distribution (also called Gibbs distribution) is a probability distribution, probability measure, or frequency distribution of particles in a system over various possible states. The distribution is expressed in the form F ( s t a t e ) ∝ e − E k T ...
 
How can I find that probability eqn with this much info (as given in question).
@JohnRennie
 
$3.8 \times 10^{-16}\% = e^{-E_a/kT}$
 
Oh I understand, very much thanks@JohnRennie
2
 
user228700
8:50 AM
@JohnR: Morning :-)
 
Morning :-)
I got my latest new laptop yesterday. Before you scream, that's the one you already known about that I bought last week :-)
 
I love it when mathematical theorems have seemingly totally random values
"the only odd dimensional spheres with a unique smooth structure are $S^1$, $S^3$, $S^5$, $S^{61}$."
"For n=1 I understand that the fundamental group is not trivial since the resulting space is not simply-connected."
Isn't that the definition of not simply connected
true if not illuminating
one paper calls the function $e^{2\pi i x}$ the infinite rotini
4
Is that standard nomenclature and if not can we make it so
apparently it is the only paper to call it that
every other google result is about pasta
A good pasta for mapping $\Bbb R$ to $S^1$
 
9:33 AM
@JohnRennie how much do you pay for shipping and handling on average for a laptop?
 
@skillpatrol you mean when shipping from a UK seller to myself (in the UK)? If so about £10 usually.
 
@JohnRennie how about international?
say, from the US
 
Shipping from the UK to India is £20-40 depending on the carrier and how fast you want it shipped. But the Indian customs will grab it and levy an import duty that you have to pay before they'll release the laptop.
If you buy from ebay.com you may find they have an option to pay the import duty when you pay for the laptop. In that case it should get straight to you.
Actually that may also be true buying from ebay.co.uk, and since the pound tanked after Brexit the laptops will be 20% cheaper.
 
cool
 
9:51 AM
@skillpatrol are you thinking of buying a laptop?
 
@JohnRennie one day
I'm in no rush.
 
@skillpatrol for what it's worth, now is a great time to buy second hand Dell laptops.
2
 
thanks, I'll keep that in mind
 
10:34 AM
@Slereah I see, so... if there is no limit on how far can Turing machines improve, then there is no way to experimentally test for the possibility that reality is a simulation?
 
You can't improve a turing machine, but there are machines more powerful
They're just not physically buildable
Neither are Turing machines for that matter
All realizable machines are equivalent to finite state automatons
 
I am actually having a hard time envision what a reality without simulation be like, I mean, you see how powerful programming is in building convincing looking scenes and dynamics, and it is not very clear what a non simulation world could allow/disallow that can make it different from a simulation
 
Don't wank yourself too hard thinking about it
The next step is creationism because you can't envision trees not being made by someone
 
or a rock too heavy for god to lift :P
 
11:12 AM
@Slereah consider deleting that
 
user228700
@JohnRennie Ah, OK :-)
 
Hi pal @0celo7
Middle Tennessee pull off a huge upset in the first round of March madness.
 
Earlier in the philosophy club I been to, we discussed a philosophy question: What is a table
and then its going down the rabbit hole from that point
 
always
 
it's pretty fun though, especially when it becomes set theory at one point
 
11:28 AM
yeah, mental gymnastics can be fun :-)
 
user228700
Eh, never mind. I don't think it might be.
 
11:48 AM
Are there any biochemistry questions on the jee? @Kaumudi.H
or even organic chem
 
Morning
 
Hello
 
@skullpetrol Isn't it just an engineering and chem test?
 
Yeah, I'm just speculating.
 
@Kaumudi.H This is it:
 
11:52 AM
Slick^
 
I feel like the only one who uses Mac lol
 
user228700
@JohnRennie Wow. Yes. Slick.
 
It's turned out to be very nice. You're never entirely sure what to expect buying on eBay but this is in excellent condition. The battery is in good condition as well. I got four hours out of it, which is excellent for a large screen laptop.
 
Then again, I do get weird looks for being a programmer and using a mac
 
That would make you "Da Mac Daddy" @SirCumference :-)
 
user228700
11:54 AM
Ur lawn looks unkempt. Is the whole "Maintaining your lawn" a thing over there?
 
@Kaumudi.H That's an odd thing to pay attention to :P
 
user228700
:-P I really am fascinated by society's obsession with maintaining lawns.
 
I'm a city guy. No lawns :(
 
user228700
Yeah, we don't have lawns either.
 
@skullpetrol sir cumf has a child??
 
11:57 AM
@0celo7 What
I'm 18...
 
That's the only thing I could think of that goes with "Mac" @0celo7
and sounds sorta cool
 
@skullpetrol Yeah, I'm not using any nickname involving the word "daddy"
 
user228700
@SirCumference Lol, yeah, no, that would be weird.
 
user228700
Dude, the book?
 
@Kaumudi.H Lemme check
Should be here later today :)
 
12:01 PM
Yup, it's ghetto lingo.
 
user228700
@SirCumference Cool!
 
Title?
 
@skullpetrol I don't think that's what it is...
 
I apologize if you're offended in anyway pal @SirCumference
I meant nothing by it :-)
 
@skullpetrol Nah, it's just a bit of a creepy term. Look it up in urban dictionary :P
 
12:06 PM
@SirCumference you've had 5 years to make one
 
@0celo7 Wow...
Knowing how innocent I've been?
Okay, this convo ends here
 
There's lots of ways that don't involve you know what
 
It is an "old school" term for a pimp.
 
@skullpetrol N-no...
Sigh, can someone tell him?
 
nvm, I got it.
 
12:13 PM
I don't get it
 
We meant Macintosh.
 
Ohhhh, @SirCumference is a girl so she can't be a pimp
@skullpetrol the fruit?
 
The computer.
 
@0celo7 That is not what that word means
And t-thanks...
 
Context is King.
 
12:16 PM
@skullpetrol 0celo was using a Mac in the pic he showed of his class
 
How do you know?
 
He knows
@0celo7 Because I use a Mac, so I'd know what it looks like
 
The apple?
 
Or it's a Windows computer running OS X
 
Maybe that talk yesterday wasn't that advanced, I'm just ignorant of operator theory
I need more books
Can someone donate $10,000 to my library?
 
12:22 PM
::crickets::
 
I'd take $1,000 too
 
::tumble weed::
 
...$500?
@Jim can u spare $250??
 
::birds chirping::
 
birds = women?
 
12:25 PM
Nope.
birds = birds
 
trivially true...
 
TIL :P
 
@SirCumference wow you must live under a rock
@yuggib agreed
 
@0celo7 I sort of do. I realize things weeks after everyone else
Like ACM's name being blue
 
in this case, 18 years
I need to get some liquid nitrogen, brb
 
Jim
12:30 PM
@0celo7 if it's for a worthy cause
 
Do you consider his library a worthy cause?
 
I always admire people who make public domain works
 
Me too.
 
I'd never have the courtesy to do it myself :/
 
(removed)
:D
 
12:37 PM
@skullpetrol That's nearly indistinguishable on mobile. Good way to screw with someone ;)
 
What happened??
 
I decided to grow a goatee
 
Jim
@skullpetrol not really, no
 
Now all we need to do is find a goat.
@Jim but it's for the betterment of the youth of our society :P
 
Jim
@skullpetrol he said goaTEE not goaTREE
 
12:41 PM
238
Q: Upgoat or Downgoat?

DowngoatGiven an image of a goat, your program should best try to identify whether the goat is upside down, or not. Examples These are examples of what the input may be. Not actual inputs Input: Output: Downgoat Spec Your program should be at most 30,000 bytes The input will contain the full goa...

We did it, Stack Exchange!
 
Goatse?
 
Oh god
 
Oh god what?
 
I didn't think anyone else remembered that
 
It's a neat image
 
12:43 PM
@0celo7 "neat"
 
Yeah. Amazing what the human body can do
 
Well, this conversation is giving me a stomachache, so I'll move on
 
@SirCumference why?
 
1:01 PM
0
Q: Why can't I edit any post?

sgrmshrsm7I currently have 103 reputation in Physics Stack Exchange but why there is no any edit option under the posts. In other stack exchange websites it appears very well and I can edit any post and the edits are applied when it is peer reviewed. But this problem is happening with me in this Physics St...

 
@BenNiehoff are there any people worrying about the functional analytic aspects of string theory?
 
probably?
but it's not something I've heard about
string field theory has even bigger problems
 
like what
 
like even having a consistent definition
in any sense whatsoever
 
ok what does that even mean
what's so hard about defining it
 
1:09 PM
so, in Wittens bosonic SFT, you have this thing called a Moyal product which describes how to glue two strings together to get a third one
it's quite tricky business
and apparently, extending this notion with SUSY is very hard
so, no superstring field theory has been written down, as far as I know
 
@BenNiehoff I've seen a bunch of things about "open superstring field theory" on the arXiv
No idea whether they're sound, though
 
ok, then probably something has been written down
it's not something I know much about
when you see popular science articles griping about string theory's lack of "background independence", this is what they're really talking about
a full string theory needs to be a quantum theory of many strings
 
is there not much string theory going on in Cambridge?
 
there is a lot, why would you think there isn't?
 
@BenNiehoff yes, I recall BBS saying it was too complicated to define
or something like that
 
1:14 PM
you left
 
also, a whole lot of different things are under the umbrella of "string theory"
I left because my job ended
postdoc jobs are temporary
 
right, right
Have you thought about doing an "Ask Me Anything" session yet?
 
he doesn't want to
 
:(
How about you then?
 
why would I?
 
1:24 PM
For fun.
 
psh! fun
 
I tried fun once. It wasn't fun.
 
what's the German word for fun?
 
It's better than its opposite.
 
@BenNiehoff I'd joke that we don't have one, but it's Spaß
 
1:27 PM
oh, right, I knew that at one point
 
at a t on the end and you have a great insult
maybe change the ß to something else too
idk, I've never had to spell it
 
Ich hat für drie Jahren in der Universität Deutsch gelernt, aber jetzt habe ich meistens vergessen
 
You could do an ask me anything session for the sake of a community spirit in this room? @0celo7 :P
I'll invite s h o g to moderate.
 
@BenNiehoff I see :)
 
1:34 PM
I'm sure that was terrible. I am much better at Spanish :P
 
No French?
 
@BenNiehoff The meaning was clear but the grammar was off
Alas, I know German grammar is not the easiest on the planet ;)
 
::bites tongue::
 
I think the second part should have been "habe ich es am meistens vergessen", but anything else wrong, I think I am blissfully unaware :P
I have also tried to learn Old English, and Dutch...both Germanic languages, but of course with slightly different rules
 
1:39 PM
Should've been habe instead of hat and drei, not drie, and using an instead of in would've been more idiomatic. In the end it should be das meiste, not (am) meistens
 
a ha!
drie is Dutch :\
 
Ha, I imagine it is. they have a tendency to misspell words ;)
 
actually, past tenses in German are confusing, since you use "habe" for everything
so it is confusing how to distinguish the perfect from imperfect
 
@BenNiehoff Not for the Imperfekt.
 
and I meant "for some continuous period of time that ended in the past" :P
 
1:42 PM
Well, then it's not different from the English past tenses with "have", is it?
 
One might say "had studied" for the pluperfect, or "had been studying" to emphasize progessiveness
 
Ah, well, we simply lack the progressive form
 
whereas in English it's mostly taken over
 
Actually, some regional dialects have it, but standard German doesn't consider these "correct".
 
What is the oxford dictionary of German called?
 
1:45 PM
It's the Duden
 
is it in several volumes, like the Oxford one?
 
@skullpetrol What does that mean?
@ACuriousMind only a little
 
@BenNiehoff There are...different kinds of volumes of it. I think the "standard" Duden is a single volume, but there are specialized volumes like one focused on etymology
 
which one is Imperkeft?
like "ich lernte?"
 
I guess the Oxford dictionary comes in many different editions, some of which are a single book
but the "full" Oxford dictionary is more like an encyclopedia...it is a collection of 20-something books
 
1:48 PM
@0celo7 yup
 
12 volumes according to wiki
 
@BenNiehoff Ah, I have to say I don't know whether language scholars would use the Duden or not
Probably not
Which dictionaries to use rarely comes up as a discussion topic :P
 
my light smattering of German is actually making it more difficult to learn Dutch
because they are too similar
 
Ah, I can imagine that.
 
but I think the biggest obstacle is my lack of effort :P
I was pretty enthusiastic about DuoLingo during the few months before moving here, and now I haven't really tried to use it at all
I always wonder how a question like this ends up on SE:
1
Q: Question about multiplets of 6d $\mathcal{N}=(1,0)$ SUSY

leastactionIn Strathdeee's "Extended Poincare Supersymmetry", the first entry on page 16 lists the massless multiplets of 6d $\mathcal{N} = (1,0)$ supersymmetry as $2^2 = (2,1; 1) \oplus (1,1; 2)$. This is the half-hyper (matter) multiplet. $(2,1;1) \otimes 2^2 = (3, 1;1) \oplus (1,1; 1) \oplus (2,1; 2)$....

because I would imagine that most people who would care to know the answer have a colleague nearby they can ask
 
2:00 PM
@BenNiehoff not necessarily
There are people in high school doing stuff like that
 
seriously? wow
 
@BenNiehoff Duolingo is pretty good - if you are and can keep yourself motivated to actually use it
 
that and actually using the language with people
I think I would do better with a more structured language course
which they do offer, but I've felt pretty busy with research so far
also, it helps if you like talking about ducks
 
why "ducks"?
 
try DuoLingo, pick any language, you will learn how to talk about ducks
 
2:09 PM
pardon my naivety
 
2:21 PM
Hi
How is it easy to see that $e^{-i\frac{E-E_0}{\hbar}t}$ oscillates rapidly for large $t$?
 
use $e^{i \theta} = \cos \theta + i \sin \theta$
 
@BenNiehoff Yes I know about the Euler formula but I don't see how large $t$ which would be in the arguments of $\cos$ and $\sine$ i.e. $\cos(Et) + i \sin(Et)$ would change the frequency of oscillations?
 
Do you recall the definition of frequency?
 
Hello
 
2:29 PM
@JohnDoe He came!
 
@Kiarash No didn't...
 
Can √-1 be plotted in the graph?
 
@JohnDoe okay Mr. Euler!
 
@skullpetrol busy revising now :/
 
f = 1/T
T = period
 
2:32 PM
@JohnDoe That's a strange statement. Do you mean that it oscillates at large $t$ rapidly if you change $E$?
 
@skullpetrol Yeah I though you meant for sine functions.
 
Just in general.
 
Because if $E$ and $E_0$ are fixed then "large $t$" does nothing
 
According to wiki Das Bedeutungswörterbuch – The Dictionary (Definitions) is one of 12 volumes.
 
@ACuriousMind This is what is confusing me.
@ACuriousMind But I think it is the wording that might be off. Will give the exact statement now.
 
2:42 PM
TIL you had a language reform in 1996.
 
@ACuriousMind It's referring to an integrand, integrated over $E$, so $E$ increases in the integrand and $t$ increases as well...Does this then imply rapid oscillation?
@skullpetrol What was you point about the general definition of frequency? How does this imply rapid oscillation with regard to Eulers formula?
 
@JohnDoe Yes, then it means that the integrand oscillates rapidly with respect to $E$ when $t$ is large.
@skullpetrol It was more a spelling reform than a language reform, but yes
 
@ACuriousMind Why does it oscillate rapidly now for increasing $E$ and $t$?
@ACuriousMind Is $E$ the angular frequency?
 
@JohnDoe No. The point is that you view the integrand as a function $f_t(E)$ of $E$ for fixed $t$. If $t$ is large, then $f_t(E)$ oscillates rapidly as a function of $E$.
 
@ACuriousMind Yeah but why for large $t$ does it oscillate rapidly?
 
2:53 PM
@JohnDoe Because the $t$ acts as the "angular frequency" when you view $E$ as the variable?
In a function $f(x) = \sin(ax)$, the larger $a$ is, the faster it oscillates
 
@ACuriousMind Oh I think I understand now. But I have to go otherwise so I can't confirm until later, damnit! Okay bye.
 
:O Ken Ham says radioactive dating is wrong.
 
@YashasSamaga And...that is news how?
 
I'm a bit slow :p
 
(Him saying it, not it being wrong)
 
3:02 PM
Earlier I watched a video of his Ark Encounter and there he was teaching little children that climate change is a hoax :|
 
Will I get it If I click on that link?
 
@BernardoMeurer Wut how does a blinking cursor use that much CPU
 
@JaimeGallego Go figure really, it must be some weird shit code
 
3:13 PM
Not too long ago computer companies recommended you leave your computer turned on 24/7.
 
@YashasSamaga I gave him instructions how he can merge his accounts already.
 
Shocking.
 
why doesn't SE have a PM system?
 
3:46 PM
If you see other such accidentally duplicated accounts, just leave a comment pointing to this help center page
@YashasSamaga Why would it need to? We're explicitly not a social network.
cf. this meta post and its linked questions
 
How do PMs define this site as a social network?
 
@JaimeGallego It wouldn't as such, but the how would the PM feature further the site's goal of providing good answers to good questions?
Content is supposed to be public here, there's not really a reason within the SE system for ordinary users to send a private message.
 
Have you read The Quark and The Jaguar? @ACuriousMind
 
@skullpetrol I have no idea what that is
 
A book by Murray Gell-Mann.
I posted a vid above of him @ACuriousMind
 
3:53 PM
@skullpetrol I see that you did.
 
@ACuriousMind Discussions beneficial to SE should be always public, yes. But the SE design hinders getting out of the system. Not everyone wants to show their email or social media accounts publicly.
 

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