egg|nomz|egg changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer.
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[Principia] eggrobin pushed 1 commit to master [+0/-0/±1] https://git.io/fpDMz
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[Principia] eggrobin 715acab - Erdős is back.
<raptop>
I mean, the lab looks like some sort of SCP.
<bofh>
oeuf: meow
<oeuf>
bofh: NaN potatoroids!
<bofh>
potatoroids?!?
<oeuf>
UmbralRaptor: eggsplain potatoroids to bofh
<raptop>
bofh: so, asteroids in KSP are actually parts that are not supposed to show up in the VAB/SPH. They're named "potatoroids", and theoretically look like gray potatoes.
<bofh>
raptop: what on... earth?
<bofh>
well what on Kerbin, I s'pose
<raptop>
That's how squad implimented them. It's part of why they don't have any gravity.
<bofh>
OHH.
<bofh>
I always wondered why that was the case.
<raptop>
They do some magic rescaling for the sizes and masses.
* bofh
stares at the recent #MeTooAcademia
<bofh>
bloody fucking hell
<raptop>
Was there another Geof Marcey?
<oeuf>
bofh: anyway apparently some potatoroids get spawned at nan somehow
<oeuf>
or maybe infinity? but probably just nan
<oeuf>
and then are nan away from a body with a geopotential
<oeuf>
and then we find the first degree whose threshold is not less than the radius
<oeuf>
where the thresholds are infinity, infinity, something, etc.
<raptop>
oeuf: place the potatoroids on lamont?
<oeuf>
this should always be at least 2
<oeuf>
but of course infinity is not less than nan
<oeuf>
it is also not greater than or equal, but it is not less than
<oeuf>
thus we pick 0, and then try to compute the geopotential to degree -1, and fail an assertion
<bofh>
augh
<bofh>
this sounds like an unholy mess
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<oeuf>
bofh: should be fixed though
<oeuf>
bofh: we moved the erdős tag and patched the release
<bofh>
excellent.
<bofh>
so is the Erdős release still slated for tonight?
* bofh
needs to install KSP/Principia/RSS/possibly RO again
<oeuf>
bofh: it's out
<oeuf>
it was briefly out and broken, then pulled, but now it's back out again
<oeuf>
bofh: also blarg forgot to give you a RSS/RO install in ANBO
<oeuf>
we could have transferred it by ereader,
<bofh>
oeuf: yeah that would've been smart >_>
<bofh>
upload to wq cloud or something? it's not that big if you delete the logfiles
<oeuf>
i think wq's butt is full
<oeuf>
bofh: clearly you just need to come back to ANBO in january or something :-p
<kmath>
<bofh453> CACKLING: "In hindsight this might have been guessed: if a no-hidden-variables theorem is impossible in 2 dimension… https://t.co/5P38oxNnIT
<UmbralRaptor>
?
<bofh>
UmbralRaptor: so like, this is one of those sentences that would only be written by someone with a background in condensed matter.
<bofh>
2 dimensions is weird and *insanely* complicated and all of the interesting stuff happens there
<bofh>
whereas for d>4 mean-field theory becomes *eggsact* for distressingly many quantum systems
<bofh>
(d=4 is weird in that it's actually a singularity and you have to often do weird things like compute RG flows in d=4-\epsilon dimensions & take a limit (usually haphazardly enough to annoy lapsed-mathematician me, tho it *can* be made fully rigorous!), but it's still not much trickier than the d>4 case beyond that).
<bofh>
and this is a paper on quantum foundations (basically, nice proofs of Bell-Kochen-Specker)
<bofh>
which, an actual person who does primarily foundations of QM wouldn't think in that manner
<bofh>
but N. David Mermin is indeed a condensed matter person primarily!
<UmbralRaptor>
hrm
<UmbralRaptor>
(also, 4+ dimensions in condensed matter?)
<bofh>
yes, it's often not irrelevant
<bofh>
b/c quantum critical points in dimensions d are "classical thermodynamic" ones in dimension d+1
<bofh>
s/dimensions/dimension/
<bofh>
like d>4 usually is totally irrelevant, but also again, MFT is eggsact, so it's a trivial case anyhow
<bofh>
literally just mention it as an afterthought on the MFT lecture in statphys
<bofh>
s/on/in/
<UmbralRaptor>
ah. I was unclear on what was counting as a dimension
<bofh>
spatial dimensions
<UmbralRaptor>
uh
<bofh>
but like, graphene or a single plane of YBCO is a 2-dimensional system.
<bofh>
it's a highly coupled 2d system, but it behaves as a 2d one, not a 3d one.
<bofh>
in fact there's a ton of phenomena that can *only* happen in 2d systems, which is why engineering various ones is a fairly large eggsperimental field.
<bofh>
(and, like, this is also a case of "quasi-2d is mostly actually 2d, much like quasiparticles and quasihorses are effectively modelable as particles and horses, respectively").
<oeuf>
at least on the fora the people asking things that don't parse have fun names https://forum.kerbalspaceprogram.com/index.php?/topic/162200-wip131-14x-151-principia%E2%80%94version-erd%C5%91s-released-2018-12-07%E2%80%94n-body-and-extended-body-gravitation-axial-tilt/&page=47&tab=comments#comment-3500548
<oeuf>
snailnamedsnail
<oeuf>
but also the fora are easier to ignore than spam on github
* bofh
is suddenly reminded of the remaining escargot at ANBO
<oeuf>
bofh: i am continually disturbed that the word for snail (food) in english is the french word for snail and not just "snail"
<bofh>
tbh I actually agree with you here.
<bofh>
also they're tasty
* oeuf
meows at bofh
* bofh
meows back
<bofh>
blackcat has started noticing when I pick up the laser pointer and gets really excited and adopts a pouncing/hunting pose before I even click it on if I do that within its eyesight.
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<UmbralRaptor>
bofh: laser aligned kitty!
<Sarbian>
oeuf: I was away in Asia
<egg|work|egg>
Sarbian: nice
<egg|work|egg>
Sarbian: why is % not a thing on top-level nodes, and what should one use instead?
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* egg|work|egg
meows at Sarbian
<Sarbian>
egg|work|egg: I remember there is a valid reason but I forgot the details...
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<UmbralRaptor>
So I turned on a bluetooth mouse I had used yesterday, and it connected to a coworker's laptop automatically instead of mine…
<kmath>
<tsplanets> Just a reminder of how different worlds of similar size can be. Top: Vesta (@NASA_Dawn) 525 km, Enceladus (… https://t.co/bcDF9OgzTT
<kmath>
<JoWolffBSG> We missed a trick in the U.K. copying American professorial titles rather than Swiss, where you can rise from Profe… https://t.co/udXXB2p9ab
<egg|cell|egg>
Yes
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[Principia] pleroy created branch revert-2016-revert-2010-1931c - https://git.io/fpDwq
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[Principia] pleroy pushed 1 commit to revert-2016-revert-2010-1931c [+0/-0/±3] https://git.io/fpSva
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[Principia] pleroy 62646d7 - Revert "Revert "Serialization of the Fine integrator""
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[Principia] pleroy opened pull request #2018: Revert "Revert "Serialization of the Fine integrator"" - https://git.io/fpSvV
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[Principia] pleroy pushed 2 commits to master [+0/-0/±6] https://git.io/fpSvr
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[Principia] pleroy 544c240 - Merge pull request #2018 from mockingbirdnest/revert-2016-revert-2010-1931c Revert "Revert "Serialization of the Fine integrator""
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[Principia] pleroy closed pull request #2018: Revert "Revert "Serialization of the Fine integrator"" - https://git.io/fpSvV
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[Principia] pleroy created branch revert-2015-revert-2011-Runtime - https://git.io/fpDwq
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[Principia] pleroy pushed 1 commit to revert-2015-revert-2011-Runtime [+0/-0/±1] https://git.io/fpSvo
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[Principia] pleroy 57c3e75 - Revert "Revert "New C++ redistributable runtime for 15.9""
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[Principia] pleroy opened pull request #2019: Revert "Revert "New C++ redistributable runtime for 15.9"" - https://git.io/fpSvK
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[Principia] pleroy pushed 2 commits to master [+0/-0/±2] https://git.io/fpSvP
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[Principia] pleroy 50c7dd8 - Merge pull request #2019 from mockingbirdnest/revert-2015-revert-2011-Runtime Revert "Revert "New C++ redistributable runtime for 15.9""
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[Principia] pleroy closed pull request #2019: Revert "Revert "New C++ redistributable runtime for 15.9"" - https://git.io/fpSvK
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[Principia] pleroy commented on pull request #2013: Distinguish AdaptiveStepParameters and GeneralizedAdaptiveStepParameters in name only - https://git.io/fpSfe
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[Principia] pleroy synchronize pull request #2013: Distinguish AdaptiveStepParameters and GeneralizedAdaptiveStepParameters in name only - https://git.io/fpDuk
<bofh>
...I just wrote the sentence "I guess I'm cosplaying a pure mathematician today" and meant it unironically, oops.
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[Principia] pleroy synchronize pull request #2013: Distinguish AdaptiveStepParameters and GeneralizedAdaptiveStepParameters in name only - https://git.io/fpDuk
<SnoopJeDi>
Prelim was today, The Committee has decided that I am worthy of a stay of execution
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[Principia] pleroy synchronize pull request #2013: Distinguish AdaptiveStepParameters and GeneralizedAdaptiveStepParameters in name only - https://git.io/fpDuk
<UmbralRaptor>
sudo chmod -x SnoopJeDi?
<bofh>
SnoopJeDi: 'grats!!! :3
<SnoopJeDi>
thank
<SnoopJeDi>
My talk was predictably too long, but seemed to be well-received, so that's something!
<SnoopJeDi>
they kept asking questions, so I didn't feel all that bad about it
<SnoopJeDi>
bofh, I had to reign in my inner mathematician (such as he exists) and stuff the fussy details into backup slides, though :P
<SnoopJeDi>
I got a pretty audible groan out of one of them when I introduced a left-handed Frenet-Serret coordinate system
<bofh>
...I mean that'd get an audible groan from me (as well as prolly a wikipedia refresher on how those work, it's been a bit) :P
<SnoopJeDi>
I mean it's maybe not even fair to say it's Frenet-Serret, because we usually choose "radially-out" in accelerators for Reasons™ instead of the typical normal vector
<bofh>
rofl
<bofh>
oh, right, Frenet-Serret is TNB
<bofh>
which is like RTN but goofier.
<SnoopJeDi>
I just didn't want to pick a coordinate system that preferred clockwise rotations, mostly :P
<bofh>
Like, that's perfectly reasonable, I wouldn't want to do so either :P