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12:00 AM
@Danu I also think that paper is about something very related, but different. I'm not sure what a T-brane is but I don't think my question involves these
@heather Mhhh, one of the better ones, but I'm still waiting for a catchy name
 
12:38 AM
So about that Iron Man suit? :D
 
1:14 AM
How about the "Process not numbers" policy @ACuriousMind
i just can't think of anything catchy =/
or concept not calculation policy?
 
1:38 AM
@JohnRennie Oh, at times Silverberg is a total hack, but he has his moments. I ran into the Majipoor chronicals early, and the scale of hooked me so I kept reading enough of his stuff to see it as a worthwhile crapshoot.
 
Crap, I didn't want to delete that
 
2:06 AM
@JohnRennie Game update:
Working:
- Movement
- Score Count
- Undo (Up to 25 moves)
- Timing
- Game Over detection
WIP:
- Rendering stats (score, timing) - Easy
- Prompting user for game options - Very hard
- Handling game over
TODO:
- Game saves
- Game reports
Bugs:
- If you press a bunch of arrow keys super quick it crashes. NO CLUE why
 
@BernardoMeurer bunch of h3 vids got demonitized
youtube moving in for the kill
 
@0celouvsky Which ones??
 
from Vape Nation to the 3 million sub one
 
What the fuck
Vape Nash?
Why??
 
YouTube has demonetized everything from "Vape Nation" to "Thank You for 3 million" with no notification and no option to appeal @TeamYouTube
 
2:09 AM
That's 100% original
 
oh shit we have twitter one-box??
 
2:20 AM
@ACuriousMind wtf is this supposed to be lol
 
less than, equal to, or greater to 0
 
so...literally anything?
 
that seems rather strange
proof?
 
2:26 AM
I guess he wants to stress the lemma holds for all $s$?
idk
maybe the proof will explain things
@BernardoMeurer so are you gonna take on your analysis prof or not?
 
2:46 AM
@DanielSank ¿Lo habla? :)
 
2:59 AM
@SirCumference idk what to do
 
@0celouvsky About what?
 
I don't understand neumann boundary conditions
or branched holomorphic operators, but that's a different issue
 
@0celouvsky I sympathize
 
@SirCumference wut?
 
@DanielSank You spoke spanish :P
 
3:02 AM
@SirCumference I had hoped to understand this stuff classically, but it is looking like I might have to go to the pseudodifferential theory
 
@SirCumference Si.
 
@0celouvsky It'll be a tough road
 
@DanielSank that set with measure zero you thought was neat is even crazier
 
@DanielSank ¿Lo aprendió o es su lengua materna?
 
Call it $K$. Then $\forall a,b\in\Bbb R$, $K\cap (a,b)$ is uncountable. It is "locally uncountable" in a sense.
 
3:05 AM
@SirCumference Lo aprendi muchos hace anos.
*hace much anos
 
nice of springer to put a picture of the author
 
@BernardoMeurer I want to play.
 
i want to talk a bit about topology and some thoughts that came to my mind on my walk today
I want to 1. look at some variety, some equation and solve it
2. Make a manifold out of it
3. Create a moduli space
4.Compute homology
5.Get betti numbers et all. and do standard stuff
6.find some homotopy class type thingy
Now I want to say more, is anyone listening . . . I have some details and motivation
. . . anyone reading this?
I want to make a correspondence between betti numbers and correlation functs in physics
 
Hey guys, I have a weird "what if" question:
 
I am sure it has been done before in some fashion
@secret am I making sense
@0celouvsky am i making sense?
 
3:16 AM
@Cows I just arrived chat, let me read a bit first
 
@DanielSank am i making sense
@secret ok
 
I am not terribly familar with algebraic topology, but from the look of that last paragraph, it seems you suggest correlation functions have a topology
 
yes more or less
 
@Cows I don't do algebraic geometry, so you'll have to tell me what kind of moduli space you want
 
@Cows I have no idea.
 
3:20 AM
@0celouvsky so far I don't have any specific thing in mind, I was just thinking of a general direction of attack. I was going to try to construct one say A/B , based on some assumptions.
 
wtf is A/B supposed to be
there's no context
 
eg Z_4
some space with some stuff moded out i guess.
 
@cows you should also try the maths chat for advice for the steps 1-6. Ted and many othe regulars are algebraic topologist or geometrist thus they can provide you more advice
 
@Secret yeah, i definitely will
so far i was curious about the thinking in general
 
(they are currently not online atm though, need to wait roughly 12 hours later)
 
3:24 AM
@0celouvsky something like solutions of x^2 +y^3 = 14 except with some stuff thrown away. As an example, though not exactly for the case I am talking about
or a s^n/{something}
then I can use some simplicial cohomology tricks
Just before i say more, I am by no stretch an expert in anything on this planet.
I am just discussing something I am thinking about
@0celouvsky do you get the general idea i am trying to head towards?
@Secret I would ping them tomorrow
Since my manifold would be solutions of n-d dim equation of variety
 
(Back to my what if questions)
 
@0celouvsky have I crawled to far out of my cave lol
 
1a. Is superposition possible if all observables commute, like in the classical case?
 
. . . . . some reference to allegory of the cave
 
1b. If 1a is true, that means we can construct non separable states, which by definition will be entangled states. What are the implications in a hypothetical world where entanglement is possible but the algebra of observables all commute?
(i.e. a world which is nonlocal and nonrealist like quantum, but everything commutes like in classical)
 
3:34 AM
@0celouvsky can you tell me how to supplement my question a bit more?
if everything commutes then Lx, Ly, Lz and other things have to be revised, you can know more things at the same time?
@Secret ^^^ eh maybe
anyone still there?
 
Do we have mchem installed yet?
 
what is mchem?
 
A mathjax thingy
 
oh, hehe
yeah don't think so
i just googled mchem hehe interesting
 
4:30 AM
@Prahar hi
@Prahar can you comment on the direction of thinking i mentioned on here labelled 1-6 in the chat
.......
bored af
 
4:45 AM
hi @allxll
 
5:08 AM
0
Q: Does something that glows red emit more heat than something equally hot that isn't glowing?

Charles PergielWatching carbon-ceramic brakes on race cars on YouTube got me started. Heat something and its temperature will go up, the hotter is gets, the higher the frequency of the energy it emits, and so something that is hot enough to glow red is going to be emitting higher energy photons and more energy....

Stefan boltzmann law?
 
user228700
@JohnR: Morning :-)
 
Morning :-)
A very wet morning here in Chester.
 
user228700
Frost/rain?
 
It's been pretty warm the last few days. We are well into spring now and the temperature has picked up a lot.
But we generally get a lot of rain in the spring as the weather is raining. The dreaded April showers!
 
user228700
Ah, OK, I see. Like I've said before, there is no "climate" in Chennai; just one type of weather, all year round.
 
5:15 AM
And the occasional cyclone just to stop it getting too boring :-)
 
oh yeah
there is a cyclone here as we speak
 
user228700
Lol, yes.
 
Good morning. We had −9 °C here this morning. And I had to wash my car yesterday, so the door seals were frozen this morning.
 
@Kenshin oh yes, you've had one of your own just recently :-)
 
user228700
Oh, wow.
 
5:16 AM
yeah there is remnants remaining
 
@Loong In Germany?
 
@JohnRennie Finland
 
user228700
Oh, hey, you guys had that hilarious video welcoming Trump!
 
user228700
Nope. That was Netherlands.
 
hey
 
5:19 AM
@Loong ah, OK, yes. You're a fair bit farther north than Chester :-)
 
wow i lelf the chat for 2 secs and everyone started talking lolz :~)
 
user228700
:36380536 Why did u remove it?
 
@Cows as soon as a Brit turns up we all start talking about the weather :-)
 
hehehe nice.
 
@Loong I hope you didn't tear the rubber of the door seals?
Don't dread the April showers @JohnRennie it makes you appreciate the May flowers so much more :-)
 
5:39 AM
Chester doesn't get very much rain. We are in the rain shadow of the North Wales mountains. So I can't complain about the rain too much. Actually the climate in Chester is probably amongst the best anywhere in the UK. Not too hot, not too cold and not too much rain.
 
This morning, there is rain so heavy that things goes into a white blurr. Currently the rain is a lot lighter
2
Q: Can a bulk crystal have a spontaneous quadrupole moment?

Tess SmidtCrystals of polar space groups e.g. ferroelectrics can have a spontaneous electric dipole moment. Is it possible for a crystal to have a spontaneous electric quadrupole moment (and higher order terms of the multipole expansion)? If so, what are the symmetry requirements for such moments to arise?

Nonlinear optics?
 
-2
Q: Need help formalizing the Other Model

Salvatore MichealThe OM, or Other Model, has grown over the years to a give a realistic, coherent, testable, and viable alternative to the Standard Model. While my hobby has been pondering the OM and all its intricacies, I’m no Feynman nor Einstein. Periodically, I’ve turned to others for help when needed to no a...

It's the infinite capacity for self-deception that most amazes me about humans - some humans anyway.
 
@skullpetrol No, they are ok. But the Finnish winter is really no fun for a car. Especially the stupid gritting material damages everything.
@JohnRennie just above 61° North
 
6:04 AM
Yup, the salt and sand they have to put on the roads really eats away at the cars.
 
Here they use some kind of crushed gravel, which causes real damage. :-(
 
 
2 hours later…
user228700
7:45 AM
@JohnR: !!!
 
???
¿¿¿
 
user228700
I'm waiting for @JohnR to respond so that I can excitedly blabber about something that has just happened :-P
 
Blabber away!
 
user228700
The shirt!!
 
Another John Green shirt?
 
user228700
7:49 AM
OK, first of all, this one isn't a JG T-shirt and secondly, no, not another one but I received this one just now!!
 
Mar 15 at 12:16, by Kaumudi. H
@SirCumference Oh! That's great! I hope you like it :-) I ordered the T-shirt :-P
That shirt?
 
user228700
Yes, that one! Holy crap, it took only two weeks!
 
user228700
I took a shower the (literal) minute that I received it and I'm wearing it now! :-D
 
What color?
 
user228700
This one:
 
user228700
7:51 AM
 
user228700
Wut?
 
Ah yes. I was trying to remember what the shirt was but the search wasn't finding it because of course it was in a picture.
 
nice color
 
user228700
I'd take another picture for you but in the first place, it looks exactly like the one in the picture and secondly, I'm wearing it now :-P
 
7:54 AM
Black is the favourite color of raider nation.
 
user228700
Man, this is so cool. I gotta try to not wear it everyday.
 
It'll look even cooler after it fades a bit.
 
user228700
I hope it lasts for a few years at the very least.
 
user228700
Eh, I should probably change. I'll wear it on my birthday and ey, it is a birthday present anyway!
 
Happy birthday.
 
user228700
7:59 AM
2 days in advance but thanks! :-P
 
user228700
I might have it tailored by then; it's a bit big.
 
user228700
 
user228700
^ <3
 
Nice to see your question on ELU.SE was we'll answered @JohnRennie
 
@skullpetrol it was a well researched answer, and I've upvoted and accepted it, but at the end of the day the answer was basically yes, no, maybe :-)
 
8:12 AM
Baggy t-shirts are in style @Kaumudi.H
 
user228700
@skullpetrol Nope. I am done with baggy T-shirts.
 
user228700
I used to have a really short hair-cut before:
 
user228700
 
user228700
...and not once, not twice but...gosh, many times people mistook me for a guy because I kept wearing baggy T-shirts and sweatpants.
 
Right, right.
 
user228700
8:19 AM
A cop once pushed me to the side from behind thinking I was a guy. When he turned around, his face turned tomato red and apologised profusely.
 
user228700
Another time, the president of a school board of some sort did the same thing; he placed both hands squarely on my shoulder and pushed me to the side to part the way. When he turned around, same thing.
 
Cops shouldn't push anybody to the side.
 
user228700
And boys at school kept running into me and then kept not giving a crap about it 'cause they kept thinking I was a guy. "Sorry bro, thought u were a guy" -_- So nope. I am done with baggy T-shirts.
 
Has all that stopped with your longer hair?
 
8:43 AM
can 2 + 2 = 5 in another base?
I here all sorts of crap from religious people
I am fighting with people who claim pi is 3 because it is stated in the Bible.
 
user228700
@skullpetrol For the most part, yes :-)
 
user228700
That was two years ago.
 
@YashasSamaga :O
 
How stupid can people be? -____-
 
@BernardoMeurer cool :-)
 
8:46 AM
@YashasSamaga interesting..
 
Yesterday, I watched a video where the Indiana government tried to redefine pi to 3.2.
in 189x
Half of them have gone mum.
A post appeared on my fb feed saying that scientists can't make DNA and amino acids.
I commented a link which takes u to Miller–Urey experiment wiki page
JT Flood They made organic material. Not a cell or any sort of life. Good try though.
Like · Reply · 2 · 4 hrs
^ that was the reply
Mycoplasma laboratorium is a designed, partially synthetic species of bacterium derived from the genome of Mycoplasma genitalium. This effort in synthetic biology is being undertaken at the J. Craig Venter Institute by a team of approximately 20 scientists headed by Nobel laureate Hamilton Smith, and including DNA researcher Craig Venter and microbiologist Clyde A. Hutchison III. Mycoplasma genitalium was chosen as it was the species with the smallest number of genes known at that time. On May 21, 2010, Science reported that the Venter group had successfully synthesized the genome of the bacterium...
I sent a link to that and he went mum.
 
Lol
 
"To even quote that experiment one is showing he's blinded by the mantra. The experiment produced a couple of Amino acids,not life. Anyway the point of course is missed that it was intelligence that produced them,not blind chance."
And there is someone who has linked me a page 100 times already.
 
@YashasSamaga 2+2=5 in base 189 I am getting a feeling you didn't solved it. Can you give link where you read.
 
It was a fb comment.
 
8:51 AM
Clickbait maybe :/
 
It isn't true obviously.
if you add two + two apples, you don't get five of them.
"With DNA discoveries as evidence, Darwinism would easily be convicted as GUILTY OF FRAUD by a just judge in a court of law." -_-
 
10:01 AM
"2 inches + 2 feet is neither 4 inches nor 4 feet.....mic drop!"
someone justifies 2 + 2 needn't b e 4
 
@YashasSamaga we already know there are lots of nutcases out there. We don't need to be continuously reminded of it.
2
 
10:42 AM
@JohnRennie Howdy
 
@JohnRennie I implemented game over detection, could you take a look at the algo and see what you think?
 
Of course. Hang on, let me get onto GitHub ...
 
@JohnRennie It's the gameOver function, line 167
No comments yet, oops
 
Looks OK. IIUC you're checking for:
1. no blank cells
2. no two adjacent cell values the same
 
10:49 AM
Yep, that's exactly it
I've been thinking about using a nicer data structure for the board
Maybe linked list
 
I think there's a danger of getting carried away with coding.
 
What do you mean?
 
The simplest solution is generally the best, assuming there aren't performance or memory problems.
 
Ah
There is a reason I thought of a linked list
But i no longer remember what it was
 
Linked lists can be a pain. Their only good point is that it's easy to insert a value in the middle.
 
10:52 AM
Ah, I recall, it was so that I can iterate over columns as easy as over rows
 
That's where you might consider using an iterator.
 
What's an iterator in C?
 
You'd need to do a bit of work to do it in C. IIRC a struct is only allowed to have member functions in C++, so it's hard to in effect roll your own class in C. But it can be done.
 
I think structs can have structs though :P
 
True, though if you really wanted to do something like this note that in C99 structs can contain pointers to functions. So a struct can in effect have a member function.
 
10:59 AM
You're feeding my addiction, I like it :P
 
Though I doubt this would be regarded as elegant code! :-)
 
I guess I will just replace the statically allocated array with a malloc'd one
 
Why would you do that?
 
Why did you choose C over C++?
 
@YashasSamaga I didn't, I much prefer C++ for these things, the professor specified C
 
11:00 AM
Aw.
 
If the board were 1000x1000 mallocing has the advantage that you can test for enough memory and fail tidily if there isn't.
 
@JohnRennie Because one of the suggested features is customizable board size
 
Ah, OK, fair enough then.
 
And right now it's a static define, but the logic generalises very well for any given board size
 
@BernardoMeurer If you care about performance very much, you can have both static and a dynamic array.
Just like the std::string
It has SSO.
Small string optimization
 
11:01 AM
@YashasSamaga I did not know that! Tell me more
 
if your string is less than 20 characters
then the std:string object stores the string in an internal array
there won't be any new or delete calls
if you use more than 20, then it allocates memory for it
 
In that case I would use your own data type for the board not a 2D array. Passing 2D arrays to functions gets hairy when the array size isn't known at compile time.
 
malloc is costly
it is expensive
it makes a system call
 
@YashasSamaga It would be one malloc per run of the program. That's hardly a major overhead.
 
then it's fine.
 
11:03 AM
I agree that continual reallocations can be a significant overhead
 
@JohnRennie It wouldn't be a 2-D array though, it would be a 1-D array with the [row*BOARD_SIZE+col] arithmetic
 
Yes
 
@BernardoMeurer Why are you not using a 2D array?
The compiler does the exact same calculation internally.
2D arrays are more readable I guess
 
@YashasSamaga I am, but 2-D arrays require static allocation AFAIK
 
11:05 AM
I might just make a struct that handles the arithmetic for selecting a cell
Or something like that
 
@BernardoMeurer int *ptr[10]
the only problem would be that you would need to allocate for each pointer
 
@BernardoMeurer that's how I would do it.
 
or you can do this
 
@YashasSamaga That's a 2-D pointer?
 
int **array = malloc(number of rows);
array[0] = malloc(size of each row*total rows);
now use the array just like a 2D array
 
11:07 AM
Hmmm
 
I fail to see how an array of pointers is simpler than just mallocing a single block of memory and doing the pointer arithmetic yourself.
 
If you wanted variable length rows then that might be a reason to do it.
Otherwise I see no advantage.
 
I mean, the row*SIZE+col calculation is pretty simple :/
 
It allows you to use the 2D array syntax
more readable code
 
11:09 AM
@YashasSamaga You mean to reference elements as foo[a][b] ?
 
That is something I would like
Then I don't need to restructure all my memory shifts and copies
 
@YashasSamaga Wrap it all in a struct - in effect a class - and that's just as simple for the consumer of the object. You hide any complexity in a small set of functions that manipulate the struct.
 
that's even better :p
 
@JohnRennie Can I have an array of structs? Take a look at lines 96 and 131 for how my history system currently works
@YashasSamaga If you have a GH account I can add you to the repo
 
@JohnRennie I don't want to lose the practicality of that history system, just some memmove shifts and bob's your uncle
 
Storing a copy of the board before each move is a simple solution though for big boards it's heavy on memory and CPU.
 
@JohnRennie Board size is kept to <= 11 by definition
@YashasSamaga Sent you an invite
 
OK, 121*4 bytes per board isn't likely to tax a modern computer :-)
 
Storing the copies is really nice and simple though, getting the previous states or adding one to history is done in a single line
 
11:16 AM
everything in one file :O
 
@YashasSamaga Also project requirement :/
I guess it's to make it easier for the prof to test 150 projects or so
Hey, at least I use CMake :D
 
Oh well, I have to go into town now. Back in a couple of hours.
 
@JohnRennie See ya later John
@YashasSamaga Do you run Linux or OSX?
 
Linux and Windows
 
11:20 AM
Okay, my code doesn't run on proprietary malware, so if you want to test it, Linux :P
::looks to John::
 
int randRange(int lower, int upper) {
return rand() % (++upper - lower) + lower;
}
it is not unform
 
Yeah, I know, I'm not super concerned about how great the randomicity is though
It's not imperative to the working of the game
If you have a simple replacement that is uniform I'll take it :)
 
You can write a function to generate uniform random numbers.
if you don't really need a uniform distribution, then it does not matter
 
Yeah, I just use that to place the random cell after each move
 
char *player_name = "";
o0
when you reassign player_name, you are going to lose the ""
 
11:33 AM
@BernardoMeurer btw that "not too oscillatory" condition for BV functions excludes strange things like sin(1/x), not sin(x^2)
So it's an nice condition, and not too strong
 
Yo wazzup?
 
What do I answer to this guy?
"If the physical world contains information how did that come to be? As a person you and I can find and interpret it. We can also create it. If information is created where did that come from?"
 
Noun: information (usually uncountable, plural informations)
  1. Things that are or can be known about a given topic; communicable knowledge of something. [from 14th c.]
  2. I need some more information about this issue.
  3. The act of informing or imparting knowledge; notification. [from 14th c.]
  4. For your information, I did this because I wanted to.
  5. (law) A statement of criminal activity brought before a judge or magistrate; in the UK, used to inform a magistrate of an offence and request a warrant; in the US, an accusation brought before a judge without a grand jury indictment. [from 15th c.]
(20 more not shown…)
 
@YashasSamaga Why does it have to come from anywhere?
 
Because everything else comes from somewhere
 
11:39 AM
It is a label.
 
The person I am talking to says god created all information. When you see an object in the shape of S, he says, god tells you that it is an S. -.-
and the we argued
 
I swear you people have forgotten what it's like to be a layman
 
and he gave that reply
and argued
 
@0celouvsky Yeah, but if you accept that then you're automatically caught in infinite regress and have to argue how you determine at which point to stop it.
 
Agree to disagree :-)
 
11:41 AM
@YashasSamaga you need to stop getting trolled on Facebook
 
^that, also
 
:P It is fun.
Few hours ago, I was fighting with someone who said 2 + 2 is not 4.
 
I promise you you'll tire of it soon enough
 
2 hours ago, by Yashas Samaga
"2 inches + 2 feet is neither 4 inches nor 4 feet.....mic drop!"
That's how he proves that 2 + 2 needn't be 4.
Poor guy does not understand units.
 
Have you lived in some sort of bubble until now and are new to the concept of people both not understanding and wilfully ignoring things?
 
11:43 AM
To be honest, this is the first time I am meeting these kind of people.
 
Hi all
 
@YashasSamaga ::shrugs:: Have fun then, but consider that most other people in this chat have probably decided long ago that such discussions are neither constructive nor interesting.
 
@YashasSamaga that's like saying 2*10 + 2*1 =/= 4*10 or 4*1
explain it like that - units, or in this case, place value, matters
 
Quick question, does anyone know how to simplify this product of a series of binomial coefficients?
$$\sum_{m = -\frac{N}{2}}^{\frac{N}{2}} \binom{N}{\frac{N}{2} + m}^{\frac{1}{2}} \sum_{m = - \frac{N}{2}}^{\frac{N}{2}}\binom{N}{\frac{N}{2} + m +2}^{\frac{1}{2}}$$
 
11:49 AM
@JohnDoe Why would you write it with those weird bounds for $m$?
 
@ACuriousMind What's weird about it?
 
@JohnDoe Why do you not just get rid of the $N/2$ and let $m$ run from $0$ to $N$?
 
"mic drop!" means he's trolling you @YashasSamaga
 
All it does is make the expression less readable
 
@skillpatrol I think he was celebrating that he managed to prove me wrong.
 
11:51 AM
In the end, when it comes to such expressions what you do is look at the identities for binomial coefficients and try to apply some of those.
There's no "magic", just trial and error (and maybe a little bit of experience)
 
Noun: mic drop (plural mic drops)
  1. (slang, idiomatic) An instance of dropping the mic....
Hmm...yeah looks that way @YashasSamaga
 
Now I am arguing with someone who says god created computers.
He even claimed that it is there in the Bible.
I am too curious now.
 
14 mins ago, by ACuriousMind
I promise you you'll tire of it soon enough
 
And there is someone who is giving threats "Note that Ken Ham said "I recently finished speaking to hundreds of kids in Arkansas, arming them against the religion of evolution/millions of years. Raising up an army!""
Religion of evolution lol
 
@ACuriousMind It's because to comes from a longer calculation hence I didn't think of simplifying the notation. But I think this is what you meant $$\sum_{m = 0}^{N} \binom{N}{m}^{\frac{1}{2}} \sum_{m = 0}^{N}\binom{N}{m+2}^{\frac{1}{2}}$$
sorry mistake
 
11:59 AM
There. Much more readable, don't you agree?
 

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