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8:00 PM
@BalarkaSen apparently harmonic analysis on groupoids is a thing
 
Aug 21 '16 at 1:00, by ACuriousMind
@peterh Have a look at this query that selects users with a high percentage of negative score answers.
Aug 21 '16 at 1:02, by ACuriousMind
If your score distribution looks like a bell curve centered at 0, you should not have thousand reputation points.
We've been here before :P
 
@ACuriousMind he has 7,000
 
Yooo
#1
 
also he gets half upvoted
 
@ACuriousMind 2016?
bejeesus
 
8:01 PM
that's way more than I expected.
 
I guess the time since that conversation is punctuated by a year-long interlude where the screen just goes black with text saying "time passes"
 
@EmilioPisanty Time flies, eh?
 
he throws around enough linguo to fool people
 
@0celo7 not that long until the 10k mark
@BalarkaSen that's quite interesting. The Top Tags here don't match the ones here
 
@ACuriousMind Quite a bell curve there
 
8:03 PM
.... but then there's this
 
Duffield is the tail end of the curve
 
LOL
 
-184 on GR
Dang
 
Soon it won't matter which sample of tags are shown as JD's top tags
They'll all be subzero
 
8:05 PM
aren't they already
 
it's pretty positive on the first page of tags
 
I wonder what happens to JD's rep if you take away the five (likely HNQ) outliers
 
He's a walking anomaly in reputation statistics
 
he's a beast
 
The Hound of Stack Exchange
 
8:07 PM
I will continue his legacy
throwing out all my GR books
 
@Slereah Arthur Conan Doyle is turning in his grave
 
Arthur Conan Doyle believed in fairies
I don't care for his opinion
 
lmao
@BalarkaSen Here is an interesting theorem for you
 
@dmckee Ah, well we should probably bring this up in our mod chat room
 
@BalarkaSen but that's a criterion that can be tested against other sites: users with a negative total answer score on their most-posted tags. As with all voting-based metrics it requires looking into, but it can be used to look for analogous situations elsewhere on-network.
CC @dmckee
 
8:09 PM
Let $f\in L^p(R^n)$ with $1\le p\le (2n+2)/(n+3)$. Then $$\| \hat f\|_{L^2(S^{n-1})}\le C(n,p)\|f\|_{L^p(R^n)}$$
 
@EmilioPisanty Oh, good idea
 
This is false for larger $p$.
 
@EmilioPisanty I suspect that the moderators and heavy users of other sites will be slightly miffed the situation as well, so recruiting them to help in a request for changes would likely be possible.
 
@EmilioPisanty Just throwing sites in there at random, I have difficulty finding another site with a high-rep user with a similarly high fraction of negatively-voted answers or a similarly high total of negatively voted answers.
 
Is the downvote system not working as intended here? What should be done?
 
8:11 PM
Consider checking Philosophy and the various religion sites.
 
@ACuriousMind yeah, that needs a suitable cross-site query
but those are a pain
and they're expensive
 
Whether this is because few other users persevere in the face of persistent downvotes on their posts or because some sort of action was taken is of course impossible to tell
 
@ACuriousMind "few" is not "all"
 
When y'all have a flawless statistical metric on the contributing factor of the users in SE, don't forget to pay tribute to me for coming up with the observation
 
Duffield is not alone in that class.
at least on PSE.
 
8:12 PM
Once Politics has accumulated aenough history it might be fruitful as well.
 
@dmckee but you'd think the same about Skeptics
 
Skeptics has a weird culture.
 
@EmilioPisanty Skeptics has a very strictly enforced "no original research" and "cite your sources" policy
 
Are they all fedora tippers
 
@ACuriousMind but you still get e.g. this kinda stuff
though I imagine that they just throw enough moderation at the problem to make it go away?
or maybe a bunch of posts that would make the SEDE query just get deleted on Skeptics?
 
8:15 PM
@EmilioPisanty I don't know if they did enforce the policy back in 2011. I'm sure you can find plenty of posts on physics.SE from years ago that don't conform to our current policies :P
 
that's maybe an interesting question for y'all to bring up with the skeptics moderator team
@ACuriousMind ah, didn't see the date
 
@BalarkaSen you need to react to the theorem so I can tell you the story behind it
hint, it related to stalin
 
Did Stalin prove the theorem
 
@0celo7 What's the essence of this theorem?
$\hat{f}$ is the Fourier transform?
 
yes
the fourier transform can't concentrate on the sphere
 
8:18 PM
Huh.
 
more generally it holds for compact subsets of hypersurfaces with nonzero Gauss curvature everywhere
 
@0celo7 I'm having trouble concentrating, too
 
then the constant $C$ depends on the surface, but still
it's very nice
 
@0celo7 does the FT also have a problem with the fat equator?
 
@EmilioPisanty what
 
8:20 PM
how did Emillio become so adept at making dad jokes
 
@0celo7 I'd need to look it up
to get the details just right
 
Hmmm...the astronomy query result looks familiar...
 
@0celo7 Kinda cool
 
@ACuriousMind Ouch!
 
So, what did Stalin do?
 
8:20 PM
How can you be so wrong about astronomy?
 
basically, the property that, in high dimensions, most points of the $n$-sphere lie on or near the equator
 
It's literally in the night sky
 
@ACuriousMind LOL
 
the person who proved this theorem got a sex change
and Stalin thought it was a great mistake because getting a sex change ruins your mathematical ability
 
@Slereah so are black holes
 
8:21 PM
@0celo7 WHAT LOL
 
not J. Stalin
 
No I understand
 
the Stalin you and I have talked about
 
@0celo7 [citation needed]
 
I am the source!
 
8:22 PM
but Big Brother said that publicly?
 
yeah
 
Amazing.
 
also they said sex changes are dangerous and we shouldn't do it
"best to leave everything in place"
 
I got a sex change once
Wasn't too bad
I changed my skeleton pelvis to a wider one
 
apparently this rant happens every year before they prove the theorem
 
8:23 PM
ROFL
shite my sides hurt
 
Stalin is a character alright
 
Since I don't know which Stalin you're talking about I'll just pretend it's Joseph, makes things funnier
 
The nickname is so appropriate
 
@BalarkaSen swedish doesn't even sound like a real language
 
i like it actually
 
8:33 PM
you like Hatcher's font
that disqualifies you from having opinions
 
Lucida Bright is the best font in the game
fite me irl
(don't, i am a weakling)
 
@BalarkaSen Eric is coming to my school for a week
I'm going to break him
that's one commie down
you're next
 
inb4 Eric turns out to be a beefed brazillian beast
 
@0celo7 taken out of context that seems kind of inappropriate here
 
oh come on
 
8:35 PM
rip in peace
i have no arguments to save you for this one
 
@BalarkaSen I wasn't going to do this without help
Stalin will provide most of the muscle
 
inb4 you realize Stalin is on your opposing side
 
they're probably a trump supporter
 
4real or meme?
 
I have no idea honestly
I don't think they care about politics
 
8:40 PM
makes sense
@0celo7 r u watching the new YLYL
 
I was
stopped and am now writing talk for tomorrow
will resume shortly
when I am done with this calc
 
kk
loved the Brad tweet at Sive in 0:57
 
idget it
 
Sive's editing the video, he added a reverb using his Sony Vegas video editor before P could finish his sentence
 
@BalarkaSen one lil succ
 
8:55 PM
5:54
 
the singing was satire, right
 
timestamp?
 
8:30
 
give me 2 mins to catch up
oh god i have no idea
also yeah the rick & morty thing was amazing
Oh GOD the Ted Cruz thing is brilliant
 
@G.Bergeron Sure, I'm saying "this theory doesn't have gravity", basically. But my point is that the theory is still "diffeomorphism invariant", which shows that this cannot be the distinguishing feature of GR. The presense of the gauge symmetry of which the Christoffels are the gauge fields, however, is.
 
9:03 PM
@BalarkaSen I don't get it
the ted thing
@ACuriousMind what
 
@0celo7 do you think I do???
its inexplicably funny
 
I don't think so
 
@0celo7 I'm having a slightly asynchronous round of the old "wtf is diffeomorphism invariance" discussion again :P
 
@ACuriousMind I gave up trying to understand that discussion
as far as I can tell, nothing hinges upon me understanding it
 
as far as I can tell, you're right
 
9:05 PM
I’m just glad we’re not doing the “what did Einstein think about GR” round
 
I should add some Einstein to my talks tomorrow
 
I just had an idea for a drink: "The Einstein" is whiskey with a single ice cube in it.
 
(I don’t mind that discussion tbh but it tends to get conflated with “what should you think about GR” and that’s just tedious)
@ACuriousMind I’ll bite: why?
 
@Semiclassical Because that's whiskey on a rock. ("a rock" literally is ein Stein in German)
 
...lol
That requires knowledge of German to really land, alas
 
9:11 PM
I never claimed it was a very good joke :P
 
I would have gone with whiskey with an actual rock in it
 
Well, some people indeed use chilled rocks instead of ice cubes to avoid watering it down
 
@ACuriousMind yeah, that's the idea
 
@BalarkaSen maybe.
 
9:17 PM
 
@BalarkaSen I can’t tell if me not finding Cruz memes funny is because I’m an ultra conservative Christian or just too ironic for normie memes
Or maybe because he’s the savior of the West. I dunno
 
I was assuming it was for the former, but I guess you have put yourself in a great dilemma
@Slereah LOL
 
Dahnald I got the votes
 
Give me the delegates
 
There was that amazing time in the election where Ted came to the light side
 
9:28 PM
The fact he was coming second for most of the primary is all one needs to know
In case you had any doubts about why who was coming first was coming first
 
Is the Newton-Cartan theory just a gauge field theory that is locally the Galilean group, I wonder
although I guess you also need to change the metric
not just the connection
 
@bolbteppa what
The person who came first was obviously the best pick given the field
 
there is apparently a bunch of weird gravity theories where you just replace the kinematic group by other ones
including supergravity
 
@Slereah does sugra do anything interesting
@ACuriousMind Are there local/global existence/uniqueness theorems for the SUGRA EoMs?
 
define "do anything interesting"
 
9:41 PM
@ACuriousMind I quite like the idea of asking for "an Einstein whisky please!"
 
@0celo7 I don't have the slightest idea
 
Isn't SUGRA basically just GR plus some Rarita-Schwinger term
Although
Ironically, showing the global existence of Rarita-Schwinger is hard, too
 
global existence for EFE is false in general
 
it has the nasty habit of being tachyonic sometimes
But from what I've read it's supposed to not be a problem in SUGRA
@0celo7 I assume super-global hyperbolicity
 
even then, Christodoulou showed that you can have trapped surfaces forming from nice vacuum data
presumably they become singular behind the horizon
 
9:44 PM
Is that like
Gravitational shockwaves
 
the proof is 600 pages
 
or stuff like that
 
it's the formation of black holes
strong gravitational radiation can make black holes
the argument is Rigorous
 
Like inward collapsing g waves?
 
Straumann seems to have an elementary construction of the wave gauge
nice
the proof I know is from Wald and uses some theory
 
9:49 PM
Rarita-Schwinger fields have this weird thing where the equation seems hyperbolic but it's not invariant under Lorentz transform, IIRC
So they can have weird causal behaviours
 
@0celo7 [insert rigor mortise joke here]
 
it's snowing
just more proof that climate change is a hoax
 
We got like...15 inches of snow this weekend
Minnesotaaaaa
 
@Semiclassical but im in the sawth
 
I’m literally standing on snow/slush right now
 
9:51 PM
@0celo7 that's some classic first page GR
A MANIFOLD
Behold its atlas
 
@Mithrandir24601 Similar: smbc-comics.com/comic/parsimony
 
@dmckee Haha! But I'd be worried they'd give me some cheap awful-tasting thing instead :P
 
Wouldn't ockham's cocktail just be ethanol
 
@Slereah ethanol's not really a cocktail though
 
neither is whisky
Just get some riot juice
 
9:57 PM
...riot juice?
 
@Slereah In my (very) limited knowledge, I went to Wiki and found: "cocktail may mean any beverage that contains two or more ingredients", so whisky with ice might count as a cocktail?
 
@Mithrandir24601 bah, might as well count some poop particles in the air that land in the drink then
 
I think the riot juice recipe is grain alcohol and blue gatorade
 
10:12 PM
this talk is basically a big copyright infringement
 
Save as “FairUseDoctrine.pdf”
 
@BalarkaSen No.
@0celo7 I'VE BEEN HIRED
I HAVE A JOB
I AM NOW RICH
 
Cool. hire me
 
@BernardoMeurer congrats
 
Congratulations
 
10:23 PM
in other news, "pack my box with five dozen liquor jugs" seems to have all the letters
 
Also yes congrats
 
@0celo7 w missing
 
@Semiclassical I would if I could
 
@BalarkaSen think about that very carefully
 
Lol, I was (mostly) kidding
 
10:25 PM
oh oops
its just not in a noun, is what threw me off
thats kinda cool
 
Does someone have a screenshot of that JD answer Rennie is talking about?
I can't see it anymore
 
@0celo7 t
 
with
has a t in it
 
lmao
 
we missed the same word rip
 
10:26 PM
fooled me cuz u pronounce it weird
 
32 letters
That’s pretty close to optimal
 
@Semiclassical it's not the most efficient
 
P A N G R A M S
 
sphinx of black quartz, judge my vow
 
is there a most efficient
 
10:27 PM
I think that's the most efficient, but it's barely a sentence
 
Hmm. How close does the fox-dog one get
 
import string

def is_pangram(sentence):
    sentence = set(x for x in sentence.lower() if x.isalpha())
    alphabet = set(x for x in string.ascii_lowercase)
    return alphabet == sentence
 
@0celo7 it'd be a good sentence in a poem or smth
 
I quite like that sentence
0celo7 clearly has high IQ
 
he's a rick
 
10:29 PM
i look like iggy pop if you count him as hot
 
The five boxing wizards jump quickly
31 letters
 
@BalarkaSen wtf
 
so many drugs
 
iggy pop would be hot for an old guy if he knew what to do with his hair
is his face a chest or is his chest a face
the world may never know
 
10:32 PM
good old iguana
 
i should be reading mcf right now
 
8 messages moved to Trash
 
@EricSilva I talked to Ecker's postdoc
 
what'd they say
 
whom you will meet and is excited that you're coming
 
10:35 PM
o
 
She said that everyone knows about the error in Chapter 5, and it's only in like one spot
 
o cool
 
@EricSilva She also said it's best to read Brian White's paper on this stuff first
 
@ACuriousMind I wonder what happens to those who stumbles upon the schtick hbar sends to the trash daily
 
which one
ill pull it up
 
10:38 PM
I think Ecker references it
"a local regularity theorem," I think
yeah
 
i will try to read it
 
@EricSilva it was in review for 3 years
 
yes
 
dude mcf pumps me up this stuff is so quality
 
10:44 PM
maybe, maybe not
I have a hard time getting excited about it
The applications are limited
 
i just enjoy working through it a lot
 

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