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12:13 PM
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Q: A tag for nuclear magnetic resonance

Emilio PisantyWhen editing a question today, I realized that, for whatever reason, we don't really have a tag for Nuclear Magnetic Resonance, and really, we should. Unfortunately, however, the obvious choice, nuclear-magnetic-resonance is one character too long (26 for a character limit of 25), so it does...

let's float this more formally, then
 
12:24 PM
@EmilioPisanty shouldn't you remind people not to downvote answers?
or do you want someone else to mention it for you?
I could leave a comment myself
"ppl dont downvote pls"
 
@AccidentalFourierTransform Why? I think people can reasonably think about a suggestion "meh, I don't care" and "no, definitely not this", and that they'd downvote the second but not the first
 
"I think people can reasonably think"
really?
 
@AccidentalFourierTransform y u use txtspk
 
@AccidentalFourierTransform Yes, I'm an optimist :P
 
There's the old saying, "if you ain't got nothin good to say, then say nothin."
 
12:30 PM
... added he
 
I've got plenty good to say, it's just very insulting!
 
@skullpatrol And how does that relate to the issue at hand?
 
@EmilioPisanty sounds good
 
-1 = not something good to say
0 = say nothing
 
That would be a general argument to not downvote anything, which is obviously not how votes are supposed to work.
 
12:34 PM
@ACuriousMind downvoting is Not NIce
 
3
Q: A tag for nuclear magnetic resonance

Emilio PisantyWhen editing a question today, I realized that, for whatever reason, we don't really have a tag for Nuclear Magnetic Resonance, and really, we should. Unfortunately, however, the obvious choice, nuclear-magnetic-resonance is one character too long (26 for a character limit of 25), so it does...

 
@0celo7 That's not true at all
 
At least not going by SE's definition of "nice".
 
12:35 PM
You can't tell people how to vote @DavidZ
 
Yes, I know that
 
@skullpatrol So why do you seem to be telling people not to downvote?
 
I'm not.
I said "it was an old saying..."
 
@ACuriousMind I was pulling a vampire and then realized that it was all nonsense and my weak formulation of the problem was nonsense.
 
12:38 PM
@skullpatrol And what was your point in bringing it up and even explaining that you meant it as referring to downvotes if you don't endorse its message as related to downvotes?
 
@ACuriousMind Not sure what to do now
 
@0celo7 I guess that's somewhere between "that sucks" and "good thing you realized that"
 
Hello @0celo7
 
@ACuriousMind It does explain my inconsistency with the normal vectors at least, partially.
 
It is an opinion. Nothing more, nothing less @ACuriousMind
 
12:40 PM
I understand the regularity theory for $\Delta u=f$ with Neumann conditions in $\Bbb R^n$ perfectly. I don't know about more general operators and certainly not about a modified Neumann conditions.
 
you know what they say about opinions...
 
:-)
 
@Slereah Hi, what's up?
 
Back at the web mill
On the web assembly line
Like a working class spiderman
 
@AccidentalFourierTransform My favourite take on that is that they're are like a certain orifice, in that everyone has one, but unlike said orifice they should be constantly and throughly examined by those having them :P
 
12:42 PM
o.o
That can take on so many forms
 
> im gonna wreck your opinion
 
-_-
 
I have many orifices
Nostrils
Mouth
tear ducts
 
Ears
 
Many skin pores
I can't say I examine most of them
Only the largest ones
The small ones are too numerous
 
12:45 PM
Anyway, voters are strange.
 
@ACuriousMind Why wouldn't I like PoE?
Ideally, I would get into Morrowind. I've been procrastinating that for a long time.
 
Morrowind is very good but it has aged quite a bit
I dunno if a whippersnapper like u would like it
 
@Slereah There is a huge graphics mod, and several mods designed to update it
 
I read an article on it a few weeks back
 
12:46 PM
This is an actual Morrowind character
yeah you want it fairly modded
 
Those graphics are better than TW3
 
Combat and graphics are shit
although
Daggerfall was even shittier for combat
 
@0celo7 It's unlike any game I know you like, the story doesn't really matter at all and most of your early attempts at characters will probably hit a brick wall of difficulty at some point where you have no choice but starting over
 
Daggerfall had this "brilliant" idea for combat
They decided that, for added realism, the movement of the sword would mirror the movement of the mouse
This was a big mistake
 
LOl
 
12:48 PM
You had to wave your mouse around to slash your sword
 
VR!
 
Well you know
I don't fault them for it
You have to experiment, that's how video games evolve
 
@Slereah Well, to be fair, Morrowind's "your sword may look like it hits but let me just roll this dice to determine if it really does" wasn't really a stroke of genius either :P
 
but it certainly didn't make it a fun game
@ACuriousMind That is what I said, yes
But Daggerfall was tiring on top of that
Also Daggerfall starts in a dungeon
So you immediatly have to do it
 
@ACuriousMind Oh, I never played Enderall because my laptop couldn't handle it.
Should I give it a go?
 
12:51 PM
Do eeeet
 
I'd prefer some adderall
 
@ACuriousMind Ok, gotta finish Blood and Wine first
That expansion is ridiculously hard
I don't think I'm playing the game correctly
the boss fights in these expansions are ridiculous
 
pure spinor anyone?
 
I'm a pure spinor
My spin is 1/2
 
1:07 PM
@ACuriousMind Did you play it in German or God's Language?
 
Why would you play it in hebrew
 
@0celo7 Neither (God's language is clearly Enochian), I played it in English
 
So
Where do I put the pushforward discussion
The chapter on vector fields or the chapter on fiber bundles
 
@Slereah Infidel!
I clearly meant Arabic
@ACuriousMind I thought the game was German
why not play it in the original form?
 
Wait, you mean Enderal?
That I played in German
 
1:11 PM
uh, yeah?
wtf would I be talking about
 
(I thought you meant TW, sorry)
 
(status controversial)
 
@ACuriousMind Alright. Wonder if I can even install it in German on an American copy of the game
We shall see!
 
@0celo7 My copy of Skyrim was in English, apart from one or two things that remained English it seemed to not matter much
 
@ACuriousMind Oh, I also have Shadow of Mordor to play
Too many games!
I need to do a fully modded run of Fallout 4
New Vegas again
etc.
 
1:13 PM
Vegas?
 
1:32 PM
@skullpatrol New Vegas
 
I hear Shadow of Mordor is pretty good
 
@0celo7 I see.
 
Low quality or negative quality?
:P
 
1:39 PM
Hey Q what's new? @Qmechanic
:-D
 
@TheRaidersofLasVegas : 72 Qs per day? :)
 
Nice.
@0celo7 is the crime rate in New Vegas lower than the real Vegas?
 
-1
Q: A different variation of the double slit experiment

igorWhat would be the image created by light if we do the "double-slit experiment" with a wall which has slits of lenght $dx$(infinitesimally small) spanning all over the concrete wall?

can you check this out
 
1:56 PM
How big is an infinitesimal? @igor
 
@igor It's not really clear what you're asking: 1. What is the concrete wall? 2. How do you propose to have "infinitesimally small" slits in a physics experiment?
 
@TheRaidersofLasVegas No
There are cannibals and stuff
 
also, what is the double slit experiment?
 
@AccidentalFourierTransform Lol?
Go back to high school
 
I see @0celo7
 
2:00 PM
Lol.
1
Q: Double slit - higher dimensions

AccidentalFourierTransformThe double slit experiment is a real-life manifestation of the Huygens principle. As is well-known, this principle depends on whether the number of dimensions is ever or odd; as Evans1 puts it, Observe, in contrast to formula $(31)$, that to compute $u(x,t)$ for even $n$ we need information o...

 
@0celo7 Yes, that's the simplest way.
 
Allo... Could one quickly answer: if I delete my own answer to a post of mine, does it forever remain "just invisible" or is there a point where it's purged from the site?
 
forever invisible
users with +10k can see it
 
right... I realize this... which is precisely why I was asking if it would eventually be purged...
 
@ZeroTheHero As a general rule, nothing is ever hard-deleted
 
2:08 PM
if it contains sensitive information, perhaps a mod could delete it for you
if that's what you want
 
by infitesimally small i mean there are slits everywhere which are very small that actually there is not a wall but there is a wall
 
If there is a valid reason you need to hard-delete something (I can think only of revealing personally identifying information), raise a custom moderator flag explaining the issue and we'll deal with it
 
@0celo7 How to note the pushforward
 
Nothing both is and is not @igor
 
no it's fine... For some strange reason I on occasion end up posting stuff that were meant to be drafts...
 
2:09 PM
$\phi_*$ or $\mathrm d \phi$
 
practically there is no wall
 
nothing sensitive...
 
Leaning toward $\mathrm d$
 
I just delete the answer but it's just useless.
 
Then there is no wall. @igor
 
2:10 PM
anyways thanks.
 
but if you threw a ball at it it wont pass
 
how
 
@ZeroTheHero Ah, then you'll have to live with 10kers forever reading your drafts ;) If you want to do your drafts without risking accidentally posting them, you could try stackedit.io
 
Not real @igor
 
2:11 PM
prove it
also it does not have to be real
 
You disprove it
 
we are assuming
 
@igor I'm afraid that doesn't make much sense. Either there is a wall, and the slits have a measurable width, or there is no wall.
The situation you are positing is physically non-sensical, so physics has nothing to say about it.
 
there are slits with measurable width
 
2:12 PM
I'll try it out thanks.
 
@AccidentalFourierTransform Please don't :P
 
assume that it is at the width of planck lenght
 
@igor That is not "infinitesimally small", and the Planck length has no particular significance in standard quantum mechanics.
 
i am just trying to find a commen ground to get an answer
i know that is not infitessimally small
 
An answer to what? If you have a bunch of slits, you get the result of the double (or multiple, I guess) slit experiment.
 
2:15 PM
what would be the image
 
The planck length is the coupling constant of torsion on the Hehl-Datta equation
 
introduce an infinite number of infinitesimal slits - congrats!, you have a path integral
 
@igor That of the standard double slit - why do you think it changes when the slits get smaller?
 
it is not about small
it is about the number of slits
 
Oooooh
 
You're asking what happens at a diffraction grating
 
name it what you want
so i made it clear
 
You need to learn these names.
 
i am just curious of what would happen at that condition
 
2:18 PM
the naming is not the number one priority
 
but if you know the name you can google it yourself
 
@igor I named it so you can a) read the Wiki article I linked and b) search for more information yourself. The Wiki article in particular derives e.g. the placement of the bright spots
 
a name is usually more than enough for me :-/
 
@AccidentalFourierTransform is that article for me
 
2:19 PM
ok
 
its a stoopid article I read once
 
It's a start.
 
@ACuriousMind ok
 
@ACuriousMind So this is basically an offline version of Overleaf?
well... the documents can be accessed offline...
 
@ZeroTheHero Yeah, it's like Overleaf, just for SE's markdown style instead of LaTeX and RTF
I dunno, if Overleaf can also do markdown, then it's pretty much the same
 
2:21 PM
Overleaf only works with an active web link...
and it's core LaTeX rather than mathJax...
I used to save my drafts on Overleaf but some of the syntax doesn't quite carry over as per LaTeX to mathJax...
 
@ACuriousMind can you take the hold back from my question?
 
done
you're welcome
 
@igor I just did, but I do think you could really just read the Wiki article to get the answer instead of expecting someone else to regurgitate it for you.
 
multiple respectives are just better than one
i am also going to read the article
@ACuriousMind sorry for the inconvenience but sometimes it is hard to transfer the image to letters
 
you would need thousands of letters
 
2:26 PM
how come?
 
"A picture is worth a thousand words" is an English idiom. It refers to the notion that a complex idea can be conveyed with just a single still image or that an image of a subject conveys its meaning or essence more effectively than a description does. == History == The expression "Use a picture. It's worth a thousand words." appears in a 1911 newspaper article quoting newspaper editor Tess Flanders discussing journalism and publicity. A similar phrase, "One Look Is Worth A Thousand Words", appears in a 1913 newspaper advertisement for the Piqua Auto Supply House of Piqua, Ohio. An early use of...
:-P
 
idioms are stupid
does anybody here work at cern
 
@igor No, that's "idiots" you're thinking of
 
@igor No, that's "idiots" you're thinking of
 
funny
 
2:29 PM
Stop telling him what to think
 
@AccidentalFourierTransform Are you trying to test my patience here? :P
 
is it working?
 
You wanna get kicked?
 
what is a good place to start learning topology?
 
2:31 PM
ok iwill start reading shades of grey
 
better than topology, definitely
 
Have fun :-)
 
or do you think idiot by dostoyevski is better
or quran
there are plenty of options
 
Choose what you like.
 
but seriously which book would you recommend for topology learning
 
2:33 PM
Do you mean basic topology or something like algebraic topology?
 
2
 
Seriously, a book at your level.
 
do you mean "both" or "the second one"?
 
2
 
@TheRaidersofLasVegas Can you try to be helpful, for once, please?
For algebraic topology, it can never hurt to check out Hatcher's free book.
 
2:35 PM
it does not have to be free
 
longer you wait longer he spends
 
is that an idiom? ;-)
 
@igor Communication is always a high priority. And while you can't know the usual name of a thing before you've heard of it, the conventional name is the way to communicate clearly and succinctly.
2
 
What does that gif mean? @AccidentalFourierTransform
Is that money?
 
I get it now.
 
good for you
 
Good books cost a lot.
 
pdfs cost none
 
PIRACY! OUTRAGEOUS! GET OUT OF HERE!
 
2:48 PM
12 mins ago, by ACuriousMind
For algebraic topology, it can never hurt to check out Hatcher's free book.
There^ @ACuriousMind I tried :P
 
> In 2010, Elsevier’s scientific publishing arm reported profits of £724m on just over £2bn in revenue. It was a 36% margin – higher than Apple, Google, or Amazon posted that year.
damn
 
Well as you know
Elsevier basically has no costs
They don't pay the authors
 
Is it groundhog day? I could've sworn we've had this discussion yesterday!
 
Only their lawyers.
 
2:57 PM
We have the elsevier discussion fairly often
Because so much hate
 
Hate destroys the hater.
Not the hated.
 
thats deep bro
you should write like a book or something
 
hello
 
@Slereah In fact the current system guarantees they have a quasi-infinite supply of people desperate to get them to publish...
 
Not to pick on a particular group but technologyreview.com/s/608266/… and nature.com/news/…
"They say that cash-per-publication incentives are common and that scientists who publish in the top Western journals can earn in excess of $100,000 per paper. "
 
> For [Western Scientists], science is venerated as a search for truth that is unaffected by self-interest.
cough [redacted] cough
 
I mean, yes
but also
all them inflated Natureses and Scienceses
totally independent of self-interest
 
Welcome back Q
 
3:07 PM
@EmilioPisanty That could use a giant [citation needed] :P
 
@ACuriousMind Source: MIT Technology Review
therefore it is true
 
Greed needs no [citation] :P
 
@ZeroTheHero also, that's in direct contradiction with the table just above it
 
Yeah, and numbers don't lie :-D
 
The table refers to amounts paid to first author only. I think the full quote may refer to the total amount paid to all authors.
I'm sorry if I'm not clear on details... I don't receive this kind of incentive.
 
3:13 PM
And frankly, the West (via Nature etc) has some nerve criticising that practice. Gild it a bit with some smoother PR and you get the decades-old machine that's been churning out inflated hype in the US and Europe for decades.
 
@EmilioPisanty Yet you are certainly aware of the credibility afforded to Nature etc by the European granting agencies...
 
@ZeroTheHero that's sort of what I'm saying
Hey @ACuriousMind what the hell happened with that diffraction-grating question?
 
@EmilioPisanty It makes me wonder exactly how long the current publishing models will last
 
@Semiclassical ages and ages =| ¬¬ =(
 
It'll definitely feel like that :P
 
3:24 PM
@EmilioPisanty Housecleaning and an overzealous algorithm.
 
they've proved to be remarkably resilient to anything the academic community can throw at them
 
true.
 
@EmilioPisanty by the way, the thesis is very interesting so far.
I'm learning quite a bit from it.
 
@heather I'm glad to hear it
 
It probably depends a lot on how much academia in general adapts
For better or worse
I find myself pretty cynical about it nowadays
 
3:29 PM
@Semiclassical yeah, I'm not in an optimistic phase these days
 
It's been joked that my handle should be Semicynical, heh
 
is there any sense in which the smaller a function space, the larger its dual?
 
@EmilioPisanty On another topic entirely: How far down the rabbit hole have you gone as far as saddle-point integration? (eg resurgence theory on the deep side of asymptotic analysis)
 
it seems intuitively true, right?
 
@Semiclassical no idea what resurgence theory is
in many ways, not that deep
 
3:32 PM
Okay. I know just enough to know how ignorant I am
(Stuff like Lefschetz thimbles, trans-series, Borel resummation...)
 
@Semiclassical none of that, thankfully
 
we like to keep it physical ;-)
 
Haha, fair enough
I'm mostly interested in it atm because of the analytic continuation aspect of it
How far can one push that etc
(It helps that one of our former post docs knew something about it)
 
@EmilioPisanty The solution does not lie with academics but with funding agencies.
 
3:42 PM
oh, Borel is fun
 
So in this sense yes... publishers are almost infinitely resilient to what the academic community can throw at them.
 
I dont know what a trans-series, but apparently they are important in QFT
 
Yeah, it's all this perturbation-nonperturbative stuff
 
neat stuff indeed
some day, I keep telling to myself
 
I ptetty much don't try at all to understand the field theory applications
Over my head. Most I'd try to understand are the toy examples
And even that gets painful fast
 
3:47 PM
https://physics.stackexchange.com/questions/346059/intuitive-response-to-single-occurence-arguments-against-statistical-events-suc
I voted to close. While this question might make for a good discussion here, but (IMO) not on the main site.
 
@ACuriousMind Can you humor me for a moment?
 
@0celo7 What's up?
 
@ACuriousMind I had an epiphany, looking something up first
@ACuriousMind I think that the usual "Green's formula" is a special case of something more general
 
$\int_{\mathcal M}\mathrm d\omega=\int_{\partial\mathcal M}\omega$ :-P
 
@DavidHammen Yeah, that was my impression too. I think the question's premise is also flawed, though: I think most non-scientists do understand what a statistical trend is and that it is not disproved by a single observation, and that in most cases where it seems they do not other forces are at work.
 
3:58 PM
@AccidentalFourierTransform Never heard of that.
@ACuriousMind $$\int_A D_if g\, dx=\int_{\partial A} fg n^i \, d\mathcal H^{n-1}-\int_A fD_ig \,dx$$
 
@0celo7 You mean the formula how to compute a solution from the Green's function and the inhomogeneity? How so?
 

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