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12:43 AM
@nbro nice find, thanks, I will join it :)
 
12:55 AM
Anyone got an intuitive understanding of div?
no
curl?
 
div is how much things whoosh out
curl is how swirly stuff gets
 
That doesnt make much sense to me, any more insight?
 
@Slereah You can join if you committed to the proposal on the A51.
@Slereah I committed, I have mixed feelings. Later it may improve.
 
1:10 AM
@JakeRose sorry, that was an unhelpful meme on my part. i'd elaborate more but i really don't have the time
i need to try to sleep
maybe someone else can help though
 
@JakeRose just google pictures of it my dude
 
Div measures how much a vector field is flowing out at a point, while curl measures how much a vector field encircles a point
 
Thanks!
I like that @Secret
I cant really see that in the maths but at least I know it
 
balarka's explanation was way deeper
and made more sense in my opinion
haha
 
balarka's is actually the same as mine, except in a more memey tone
 
1:13 AM
curl measures mucho swoonswoosh
div is bloomfblast
 
o btw, even the laplacian have a geometric meaning
 
@Secret i'm not saying anything that makes sense right now
so don't reply to it like that
@Secret are you a synesthete or nah
answer the question
 
not really, otherwise I won't be asking geometric meaning questions everywhere
The specific point about the lapacian is sometimes mentioned in lecture and texts, especially in the context of mean value theorem of multivariable functions
 
oh you're not
what a weird weirdo then
how are you so visual with your dreams and stuff if you're not
and also your drawings
 
Well, I am a visual learner, I learn a lot better with pictures in general
 
1:19 AM
hm
how do you know you're not a synesthete?
did you test it
y'know it's a lot more subtle most of the time than popular descriptions of it seem to say it is.
 
well, I am not sure, but my guess is my parents should have ran all the tests when I am young and I don't recall them telling me I e.g. see colours from looking at numbers
 
do you see them in your head?
what colour is 3
anything?
don't try too hard or else it doesn't count
 
Nothing for numbers as far I know, though I do recall back in my high school, ammonia smells with a texture of a ribbon of sorts
Some smells also give me an impression of a powdery texture
 
anything else?
music?
how does music look
 
Does it count as synesthesia if I am reminded of food when listening to certain kinds of music
black metal tastes very grainy
 
1:22 AM
Most music tend to give me some movie like impression, but it is not always a visual scene
 
wow same actually
black metal reminds me of rye
but it didn't occur to me until you mentioned it
 
wow
 
@Secret oh alright
 
that is, for some music, my brain will came up with a movie scene that fits the vibe of the music, other times it is just feelings and no images
 
makes sense
synesthetes and visual people can be disjoint
so i guess that makes sense
 
1:25 AM
Here's a very strong example when I was composing some short fragment, the inset that I drew is a 3D game redner like scene that pops up in my mind when I listen to it youtube.com/watch?v=F2pBMDHz4Os
So far that's the only example I have drawn, though I do experience movie impressions in many musics in the past
 
which came first
that's actually pretty important
 
for this particular case, the music is composed and as soon I played it, the 3D game like render mental image popped up (which my drawing skills and time constraint does not allow it to be captured as a full colour drawing)
for other cases, it spans the spectrum from music first image next, or image first music second or happens along the way as the music is listened
 
i see that actually
that's pretty close to what i see in my head when i listen to it
but i guess yours is overlaping all the frames
in one image
 
Yeah, it's impossible to draw them in such a short time, because the actual experience is a movie or at worse, a gif, I see mental animations often when thinking about what I learnt
I don't know if that counts as synthesia, I often just treat my mental experience as inspirations that is triggered by something in the surroundings
Some more interesting things include when sometimes I am doing work as usual at my computer, suddenly there will be an orchestra (both visual and audio) pops up and then I will often try to open the nearest sound software to jot down the music I hear before the memory fades
 
hmm that's interesting
i think i only had something like that maybe 3 times in my life
 
1:33 AM
but I don't know if that's synthesia or just spontaneous daydreaming
 
where i randomly had some original melody pop up in my head
 
-4
Q: Einstein was a troll

Sjsj DjejRelativity is Lorentz ether transformations. Einstein called everyone else wrong while pretending he had something new to say. He didn't. You can all go home now.

anybody with a nail looking for a coffin?
 
@Secret synesthesia is just thinking in terms of associations and also having involuntary associations of different senses with each other
so symbols or sounds to colours or shapes etc and other weirder stuff too
often even ideas look like something
not necessarily useful though
 
@EmilioPisanty I have posted a very relevant comment
 
you forgot
(NOT CLICKBAIT!!!)
 
1:36 AM
Added accordingly
 
well, I think what I experienced the most are what acuriousmind called free associations, which when experiencing certain events or recalling some memories or hearing the name of some people, it triggers an avalunch of memories and ideas (which can be purely ideas, or can be audio,visual) that continue to free associate along the way and create a chain of explosion of ideas
 
@Secret yeah but i think lots of people have those
i guess it's just that
some people have longer ones
or more elaborate/complex ones
 
a lot of people recognise in me what I often refer as weirdness, are often because those discussions and questions arise from taking something form that chain of free associations.
 
i think the fact that you bring it up in the first place has a lot to do with it too
most people having a free association won't mention it during a discussion
 
For example, the quantum organism thought yesterday is actually inspired out of nowhere after I listen to a chemistry seminar and then saw the speaker talking about wavefunctions , which then somehow mixed with the bacteria evolution scene in previous night dream
My hindsight analysis of that chain suggest it might have to do with both the notion of evolution and wave function share a notion of delocalisation, thus causing the two thoughts to spontaneously fuse
 
1:40 AM
yeah but i mean
that's called thinking
is it not
to say that only certain people have free associations i think is false
 
I agree
 
i used to think a lot of the way i thought was really special but then realized other people have their own versions of it too
but i guess some things are different
 
Well, that I am not sure, because often the ideas just pops up at that moment, and while it seems I discuss it as if I am actively thinking about it, that's actually a hindsight retrospective after the event by using as many of the emotions and things I remember when the idea pops up in order to try to analyse it
 
i understand but the thing is most people wouldn't discuss it in the moment
because they don't want to come off as aloof or weird or not listening etc
i guess what divides normies with cool people (weirdos) also has something to do with how often they actually share their thoughts too
 
Hey guys
 
1:44 AM
that's true, most people tend to think of this as weird or socially inappropriate. But I don't really care much, as the first thing people need to understand about me is that I am weird and I won't try to hide it as long I don't affect their normal lives
 
are you autistic
lol sorry i don't mean it in that way
 
@Nat The SO is a prospering company for me. Some years ago there were posts that they've got some $40million investition. Maybe now the investors want to see results ($$$) and they've expected more.
 
legitimate question
 
I am aspergic, which is one part of the autistic spectrum
 
ah yes
hello fellow sperg
XD
 
1:45 AM
It's not a thing to be ashamed about being autistic, cause we are extremely good at ignoring irrelevant things and do things efficiently
 
How would you find the flux through the diagonal face cutting through x and y ?imgur.com/a/YLJCb
 
I often found social norms and social politeness unnecessary inefficient on sharing knowledge as I constantly rant to acuriousmind about that
 
I think people who are part of the spectrum are really cool.
Shitheads stigmatize autism because they have a narrow view of human interaction
 
@Secret well yeah lots of things are unnecessary you know
 
@Secret Are you sure it is an existing condition? I've always had the impression, the reason of "bipolar disorder", "ADHD" and the other "new" problems that there are more psychiatrists than well-paying customers
 
1:47 AM
i used to rant a lot too but then i realized it was pointless because i'm pretty sure other people are aware of the uselessness of some social norms but still do it anyway
because they don't care
 
@Secret Most of us are thinking so on the Internet. :-) And, I think, we have right and not the rest of the society. :-)
 
@peterh Well, Asperger is recently removed from the (what's the name of that medical handbook again?) and simply lumped to the autism spectrum, whereas ADHD is still kinda disputed though I do recall it is currently not recognised by that handbook
 
DSM @Secret
 
My parents said I am also madly ADHD, which for me is not much of a problem and allows me to access this huge idea generating apparatus that is free associations
O btw, the aforementioned free association lead to this question:
2
Q: Are there examples of history dependent quantum dynamics that evolve like biological life?

SecretThere are examples of time evolution of quantum dynamics with history dependence, such as these quantum random walk examples which make use of a memory parameter to influence the distribution of the random walk. I am wondering whether the rules of quantum mechanics allow the construction of a ve...

 
@Secret Once a psychiatrist said to me, that really, not they decide, what is a psychiatric disorder, but the society. They are only wanting to be good to categorize and improve the conditions.
 
1:50 AM
That's how I came up most of my SE questions. They are mostly inspired from my dreams and free associations
 
I have thought about the analogy between random walks and evolutions before a little bit
Not sure if it's relevant to your thoughts
 
@peterh indeed, and there are hotly disputed, so it is not a trivial issue. The DSM is for bookkeeping, the society is the bookeeper
 
random walk with genetic algorithm @BalarkaSen
= evolution
 
There's a theorem somewhere which says there's a nonzero probability a two dimensional random walk, after a finite time, ends up at a point distinct from the starting point
 
and some optimization
 
1:52 AM
yeah, one characteristic of life is the ability to store inheritance information, which is what allows natural selection to take place and to adapt
 
Anybody looked at my question ?
 
That's kind of like saying if you assume in the Darwinian sense that natural selection is a random mechanism, even then there's a nonzero probability you will evolve into something other than you already originally were
 
so it is not just a random walk, but one with some history dependence
 
(Cringe warning because stupid ideas)
@Secret Ah makes sense
Yes of course
 
A usual random walk, if I recall, does not depends on history, as all the stochastic equations are local
though I know little about random walks in general, like most of the maths subjects
 
1:54 AM
I wish I did
 
I just happen to have a dense set in the knowledge of mathematics to answer either the very simple or very hard questions from my studies
but I don't have the meat, which are deeper understanding of the theorems, that will require reading actual books
 
you should read actual books
 
hey that's me
 
@Secret I think all the geeks are more or less "aspergic", and it is not a sickness. The "symptoms" what we can read on the wikipedia, match practically all the smart, IT boys. And I have an impression, that even most of the autistic children are in fact healty, in an unhealthy environment, for which they can't react better.
 
@peterh go away
 
1:56 AM
that will come after the PhD, I plan to solidify my abstract algebra using pinter first
because that's the field of mathematics I am most interested in
I think I disagree, autistic brains are quite different in structure even at toddlers, so it cannot be just an environment/nurture thing
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4688328/
but being sick does not mean they are a liability.There are so many people losing limbs and various other things yet they do a lot of contributions than ordinary folks
 
@Secret not sure if anyone got back to you about that, but unfortunately we can't. What we can do is bug the math mods about it and let them take over.
 
so you guys cannot see who starred what outside of the native chatrooms?
I actually don't remember which of you are global chat mods
 
@Secret that is... technically correct :P
 
Anybody?
 
oh that reminds me
 
2:01 AM
We can't see who starred things in our own chat rooms either
 
@JakeRose do your own homework
 
If I wasnt stuck on it I would :)
 
O wow, no wonder that Star Bridgate is wrecking havoc in the other chat room and remains uncaught
 
@diobuceulb that was a bit harsh
 
@DavidZ i know i was just roleplaying a triggered person
supposed to be ironic
 
2:02 AM
@diobuceulb in that case, stop.
 
@JakeRose try finding the normal vector of the surface and then integrate your vector field over that area
 
@DavidZ please go away
you're not a good mod
I hate u
 
That post lacked so much irony it might as well be a felsic igneous rock
 
he said please @DavidZ
you can't touch him anymore
 
I also do earth sciences unfortunately
Im having trouble finding the normal vector
 
2:03 AM
@JakeRose That's... actually a good roast.
 
Thats the main bit Im struggling with
 
do you have the equation for that plane?
 
Ok, can you reiterate your question?
 
@Secret We can bring up the issue with the SE team, and then after that it's kind of case-dependent what if anything gets done about it. But by convention we usually leave that sort of detailed investigation to the mods of the site that "owns" the chat room.
 
the main issue is that all 4 of them are inactive for many months already
 
2:05 AM
Okay so we need to find the flux through that plane
 
so math chat is kinda unmoderated and having that overstarring mess
 
So I have two issues
Finding the unit normal
And then doing the double integral because its not in line with either x or y axis
So I dont think I can do dzdx or dzdy
 
I am not sure if there are more efficient ways to make them aware about it
 
If your surface is given by $f(x, y, z) = c$, do you know how to find the normal using the gradient?
 
I dont think it is given by that
 
2:06 AM
@Secret 4? I thought math had like 9 moderators
 
well I don't know the context so I'm just guessing
 
imgur.com/a/YLJCb
Have a look at that image there
 
4 owners of the room, only 3 of them are listed as mods
 
The one parallel to the z axis and doesnt go through the origin is the one Im talking about it
 
I guess I might overlook non room owner moderators, let me quickly check
 
2:08 AM
@Secret yeah, mods who aren't room owners aren't listed anywhere special on the info pages about the chat room, but they have mod powers there nonetheless
 
but I guess the main issue here maybe not that, you told me about something that I don't know about
7 mins ago, by David Z
We can't see who starred things in our own chat rooms either
 
@JakeRose The equation of that plane is $x/2 + y/4 = 1$
 
Here in the h bar we try to stay on top of making sure the moderators are all listed as room owners (helped by the fact that we only rarely have elections), but other sites may differ
 
so that means we cannot catch that Star Bridgate unless we some contact the SE mods, cause perhaps they might be able to find who is persistently starring stuff
 
How did you calculate that?
 
2:10 AM
I guess for now, we can try to bug the math mods to contact the SE team, and get them to look into the issue, cause recently that overstarring is escalating and many users found it disruptive
 
@JakeRose If a line on the coordinate plane goes through $(a, 0)$ and $(0, b)$ on the x and y-axis respectively, it's equation is $x/a + y/b = 1$
 
@Secret pretty much, although that gets into that case-dependent stuff I mentioned.
 
You can check that for yourself, because that line passes through those points
 
@Secret Indeed. That seems to be the best course of action. I'll get in touch with a math mod and ask them to look into it.
 
In this case, your plane is just the plane that intersects the $xy$-axis on that line and is parallel to the $z$-axis
So the same equation determines the plane in 3-space.
 
2:12 AM
How do I get past the issue of doing the area integral when its not in the plane of the axis?
 
Depends on what your vector field is that you want to compute the flux of
 
The vector field is F =(0, (y + 2x − 4)^2, 1 − z^2)
 
Oh god that looks ugly
 
It was 6 marks to find the flux through each individual face too
 
Well so it has no components in the x-direction
Ugh i don't think I can do this. i'm way too sleepy
Post your question clearly in the math chat and I'll star it so that it gets someone's attention
 
2:20 AM
done
 
Starred
 
2:59 AM
Is there any magneto-like gravitational phenomenon occurred by massive current? I.e. analogue of magnetic field generated by current
 
@BalarkaSen Please tell me you are here
 
Barely
 
My essay on Gulliver's Travels starts with a formal definition of a Turing Machine and an introduction to complexity theory
I just wanted to say that
 
jesus
 
This thing is in it
I'm modeling linguistic understanding as graphs, showing it's NP-Completeness, arguing that that's why it's hard to understand people, and the doing a case-study on Gulliver's Travels with how Satire exploits this mechanism
 
3:12 AM
I think you have finally cracked
Soon you'll be dissecting Disney movies like Jordan Peterson
Pinocchio is actually a very crooked person
 
I FOUND A WAY TO TREAT HUMAN UNDERSTANDING AS GRAPHS BALARKA
WE ARE JUST FANCY STATE MACHINES
IDEOLOGY IS GRAPH PATH TRACING HEURISTICS
 
3:50 AM
Stephen Hawking has died.
20
Thank you for everything
 
Oh :(
 
OMG..
 
4:13 AM
BBC obituary doesn't mention his best book
JFC
 
My god...
RIP Stephen Hawking
Seems Bernardo already said it
 
they say his history of time was his first book
what nonsense
 
Hawking is dead
 
RIP :(
 
4:43 AM
“I have lived with the prospect of an early death for the last 49 years. I’m not afraid of death, but I’m in no hurry to die. I have so much I want to do first.”

-- Stephen Hawking
 
RIP Stephen Hawking
 
5:28 AM
RIP, you have already outdone the limitation of that deliberating disease
 
5:47 AM
@JohnRennie Hey ! Good morning . Did you hear about Stephen Hawking ?
 
You mean have I seen the messages immediately above yours? :-)
 
I felt shame, crying on the train.
 
Everyone dies, and most of us leave the world a better place than we found it, if only slightly. Stephen Hawking made more difference than I ever will.
 
@JohnRennie yea , and he died in his cambridge house
 
@JohnRennie You're only 57. There's still time.
 
5:52 AM
Sadly the only achievements I'm notorious for involve food and laptops. I doubt there will ever be a Rennie's pizza theorem.
 
@JohnRennie You make contributions too ,everyone does , its just how people perceive it
 
I wonder what happens when you collide laptops and food ...
Actually, now I think about it I have seen someone's lunch collide with a laptop and the results weren't pretty :-)
 
@JohnRennie Today is the first day of the rest of your life.
 
@DawoodibnKareem wow :)
 
6:20 AM
Everyone, save the internet from misinformation:
4
Q: How does bra-ket notation work?

Ella RoseQuantum algorithms frequently use bra-ket notation in their description. What do all of these brackets and vertical lines mean? For example: $|ψ⟩=α|0⟩+β|1⟩$ While this is arguably a question about mathematics, this type of notation appears to be used frequently when dealing with quantum computat...

 
6:35 AM
Oh joy. It's Windows update week ...
 
@JohnRennie lol you got it too ?
 
I look after about 500 Windows servers and they'll all be updating this week. 99% of the updates will go fine, but 1% is still 5 servers that will encounter problems and need nursing back to full health.
 
@JohnRennie Your special talent is for explaining things. Have you thought about writing a book on GR?
 
@DawoodibnKareem I've toyed with the idea of writing a book on SR, but writing a book is very different to answering questions because you don't have that interactive element.
I think it's much, much harder to write a really good book than it is to answer questions here.
 
I'm sure you could find someone to interact with.
I mean, what if I come up with a list of questions about SR, and you merge the answers to them into a book?
 
6:46 AM
Apparently Hawking died
RIP
 
Sid
RIP Stephen Hawking.
 
His world line just terminated. He is geodesically incomplete.
 
Press F to pay respect
 
7:21 AM
I have no controllers..
 
@Slereah Yo Sam, what's good reading material on the Well-Ordering Principle/Theorem?
I asked Ryan and he told me to ask you
 
@BernardoMeurer you're getting dangerously interested in mathematics ... :-)
 
@JohnRennie I'm using graph theory to argue about Gulliver's Travels, I'm past the second fake-bottom of the well
 
And its been the ruin of many a poor boy
And God I know I'm one
- The house of the monotone convergence Sun
 
7:39 AM
@Slereah yep :'( cai.cam.ac.uk/news/…
 
8:21 AM
:(
 
Wait
Did the most important person weigh in on his death yet
Yessss
 
@Slereah y u no answer
 
@BernardoMeurer I do not know
 
@Slereah Do you know someone who might know?
 
I do not
I usually get my set theory from Metamath
but it's a bit dry
 
8:28 AM
Why does Luboš Motl want me to date a Russian single beauty?
 
Who doesn't
 
Stephen Hawking:
'Born on Isaac Newton's Birthday, Galileo’s 300th death anniversary,
Stephen Hawking died on a 14 March
Albert Einstein was born on a 14 March
They both died when they were 76.
14 March is "Pi Day"
wtf
 
@DawoodibnKareem is she russian
 
Galileo's birthday date = Richard Feynman's death date
 
@Slereah No, but she doesn't want me to date a Russian single beauty. Although to be fair, I didn't actually ask her.
 
8:31 AM
different year though
 
Maybe those factoids are wrong, this can't all be true
 
@DawoodibnKareem is that one of the ads on his site? If so, I'm a bit concerned I don't see that ad! :-)
 
Oh, John, I'm happy to send you the details of that ad if you need them.
 
:-)
 
"I've stood next to him once in Santa Barbara. We never wrote a paper together but my collaborative distance from him was 2 once we wrote papers with Andy Strominger."
They were practically brothers
 
8:33 AM
You can learn a lot from Lubos, a lot of what, and what not, to think
haha
 
"The word Hawking appears in 431 TRF blog posts. I think it's hard to find another name that is more widespread on this website (e.g. Trump has 253, so much for the claims that there's too much politics here) – and it's impossible to find another personal weblog in the world with 400+ texts referring to him."
 
@Slereah So you have a Motl number of 2? Impressive! Makes me think about Bacon.
 
Well, Hawking has a Motl number of 2
we can't all be so lucky
 
A meager 2 Motls
 
Although Motl once answered a PSE post of mine
 
8:36 AM
and one of mine.
But that doesn't really count as co-authoring a paper.
 
:D
 
He didn't like it very much
 
No need to be ashamed, @bolbteppa
the world must know
 
Are you worried that Motl will one day be a moderator here, @bolbteppa?
 
My number is Motl -1 in other words
 
8:40 AM
No, that would require a very special talent.
 
*I wont shame him the way he shames others motls.blogspot.com/2007/11/exceptionally-simple-theory-of.html
What a post, that is up there with great internet things
Apparently Hawking made his students read this before doing anything else
So all those who want to be great, this is your first step
 
I have it
Tho I did not read it all
I do recall a rather bold statement in it
About how obviously a theory of quantum gravity should include topology sums
 
Jesus, was it always that expensive?
I don't think I spent that much
Are textbooks getting more expensive
 
Those books which are tons of papers binded together are always expensive for some reason
 
8:45 AM
Even worse when they only exist in those books
I had to buy a bunch of them
 
This is my favorite Hawking thing right now
Just think of the psychology behind all of it
 
@bolbteppa have the courage of your convictions or don't post at all
That whole posting and deleting thing is annoying
 
It's not working for some reason
 
@Slereah I'm agreeing with Motl??? I might need to see a GP
 
"if he's so smart, why did he die?"
 
8:56 AM
@bolbteppa Haha!! I'm not surprised! He has a good number of these sitting in his bookcase in his office :P
 
"Wake up sheep. How do you know he was even alive all this time? Doctors expected him to live to 21. That artificial voice? Fake and a long running false flag sociological experiment for the scientific community. Motor neuron disease severely hampers brain activity, you expect me to believe he invented all his theories by himself. Hahaha. He has been dead for over 50 years and replaced by a team of actors a long time ago! Notice how he looks the same in 2018 as he did in 1982.
The robot voice that emanates from that computer has nothing to do with Hawking – it's just information that NASA w
 
I just want to tell all those people, Hawking was against Brexit, and see what happens
 
Apparently he was also instrumental in faking the Moon landings
 

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