UmbralRaptor 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> … one of the other grad students just compared me to nomal O_o | <ferram4> I shall beat my problems to death with an engineer.
<egg|zzz|egg> yay
<UmbralRaptor> Current pressure is 100.7 kPa.
<soundnfury> egg|zzz|egg: is there anything special about [2^n] here, or are we just trying to count semigroups over sets of size k and then setting k = 2^n?
<egg|zzz|egg> nothing special about 2^n
<soundnfury> well then see https://oeis.org/A001423 (although what are our isomorphism rules?)
<soundnfury> (first result when googling "oeis semigroups")
<soundnfury> if oeis only knows it up to k=9 (and has keywords 'more', 'hard') then it's too hard for me ;)
<egg|zzz|egg> this is the isomorphismless one https://oeis.org/A023814
<egg|zzz|egg> also stops at 9
<egg|zzz|egg> bofh: that points toward's atlas's hasty search being a tad too hasty though, no idea whence his number
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<kmath> <stephentyrone> @eggleroy @UINT_MIN Also: love that the OEIS entry references a 27-year old post by my co-worker of 11 years =)
<bofh> ROFL
<bofh> WAIT A SEC
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<egg|zzz|egg> bofh: hm, so re. the "feeding that into the waveform generator" bit, how do I get amplitude(t) from frequency(t)
<bofh> sin(pi*frequency(t)) ?
<bofh> :P
<egg|zzz|egg> bofh: I don't think that actually works for non-constant frequency and large t? you dephase things by changing the frequency which seems wrong
<bofh> egg|zzz|egg: why won't it work for non-constant frequency? like it won't sound identical to the Trappist system video, which seems to derive the mean motion period and then feed that as a piano key, but IMO it sounds more interesting to directly frequency modulate a sine by the orbital periods.
<egg|zzz|egg> bofh: yes, but I don't think that's directly frequency modulating the sine? say you (discontinuously) halve the frequency, I'd expect the amplitude to remain continuous (and to just continue at half the frequency), not to randomly jump in a way that depends on the value of t
<bofh> okay, so you want frequency modulation and I indeed gave phase modulation above
<bofh> hm
<egg|zzz|egg> bofh: also retrobop is, um, apparently not bound unless you take into account the mass of the inner satellites Ꙩ_ꙩ
<bofh> wait what the actual fuck
<egg|zzz|egg> and even then the Keplerian Jacobi periods vary by nearly three orders of magnitude?
<bofh> congrats on making a system more chaotic than Hyperion's axial rotation
<egg|zzz|egg> bofh: like that mostly highlights the shittiness of osculating elements
<egg|zzz|egg> they're shitty and then the ляпунов exponent amplifies the shittiness :D
<bofh> I wouldn't say shittiness necessarily - they're quite okay unless you have a highly chaotic case/large ляпунов exponent.
<egg|zzz|egg> bofh: well, things can be weird *points at the moon*
<egg|zzz|egg> precession everywhere :D
<egg|zzz|egg> not sure how the osculating periods vary there
<bofh> egg|zzz|egg: it strikes me as being dominated by 2 to 3 sinusoids honestly.
* UmbralRaptor files Yemeni under "tasty cuisines"
<egg|zzz|egg> bofh: yeah, and tbh so is retrobop, just with a bunch more sinusoids
<egg|zzz|egg> except the amplitude is silly
<bofh> so like there's a difference between needing 3 terms of a fourier series and 30 to get reasonable behaviour :P
<UmbralRaptor> bofh: Just don't choose a reference frame with square orbits.
<bofh> ...
<bofh> SQUARE?!?
<egg|zzz|egg> https://forum.kerbalspaceprogram.com/index.php?/topic/161390-principia-challenge-munar-retrograde-rendezvous-122/
<egg|zzz|egg> bofh: that's pretty square http://i.imgur.com/OIoUz9G.png
<UmbralRaptor> ^
<bofh> *boggle*
<bofh> that's *stable*???
<bofh> "Altough it's just outside the hill sphere of Mun it's still stable. This is a neat characteristic of retrograde orbits." oh right I keep forgetting about this property
<egg|zzz|egg> looks like this in the barycentric rotating frame http://i.imgur.com/PEEAn9W.png
<bofh> okay that's far more reasonable.
<kmath> <eggleroy> My entry for a Principia trajectory optimization challenge, with a low-energy transfer. https://t.co/dn1NF2sQ0Q https://t.co/D6XKeEn3im
<egg|zzz|egg> bofh: but the square is actually there, in the mun-centred inertial frame :D
<egg|zzz|egg> bofh: and in the KCI frame it's this http://i.imgur.com/sgDadPf.png
<egg|zzz|egg> bofh: maccollo has found pentagonal and higher orbits too
<bofh> oh gods I'm actually a bit horrified but also tempted to fire up Principia/KSP now :P
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<kmath> <APOGEEsurvey> SiO masers are microwave-lasers associated with stars. They are typically found in stars loosing mass - like AGB stars (aka the best stars).
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<whitequark> lol square orbits
<Fiora> it's hip to be square
<egg|phone|egg> !wpn Fiora and whitequark
* Qboid gives Fiora and whitequark an amphibious theory
<kmath> <whitequark> #catcognition cat is clearly afraid to go on a walk without me. loudly refuses to be further than ~2m :/ https://t.co/LxuguZ6IyO
<egg|phone|egg> !Wpn -add:wpn pigeon
<Qboid> egg|phone|egg: Weapon already added!
<egg|phone|egg> Whitequark: there is also surplus killing, not sure if that counts
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<whitequark> egg|phone|egg: oh nice
<whitequark> yeah that does count
<egg|phone|egg> "From the cat's point of view not only do birds not play fair by flying and having eyes that can see beyond the back of their heads, but they can positively cheat by using loud alarm calls and throw the cat's chances of catching any others."
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<whitequark> lol
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<kmath> <hauck> Green Eggs and Pan. #CassiniABookTitle https://t.co/FHwUVA3irS
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<egg|zzz|egg> !wpn bofh
* Qboid gives bofh a Maxwell-Boltzmann electron
<egg|zzz|egg> !wpn whitequark
* Qboid gives whitequark a solid 
<UmbralRaptor> high energy electron.
<UmbralRaptor> !wpn egg|notzzx|egg
* Qboid gives egg|notzzx|egg a capacitive planet with a Principia attachment
<egg|zzz|egg> !wpn UmbralRaptor
* Qboid gives UmbralRaptor a fake metric
<UmbralRaptor> No, Qboid, we will not create an Electric Universe variant of Principia.
<egg|zzz|egg> who needs tides when you can have Bremsstrahlung
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<egg|zzz|egg> !wpn котя
* Qboid gives котя a linear keyboard
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<bofh> !wpn egg
* Qboid gives egg a repeater
<bofh> 15:25 <@egg|zzz|egg> who needs tides when you can have Bremsstrahlung
<bofh> LOL
<kmath> <samthielman> I have RTed the shark that was on the highway with which you were probably trolling for favs Forgive me it was viral so fake and so old
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<SnoopJeDi> isn't social media *great*?
<kmath> <johannateske> Reminder to astro folks, especially those w/o permanent jobs & esp. esp. on job market: It is to your great advantage to have a website.
<egg|phone|egg> UmbralRaptor: should ANBO be a thing :-p
<UmbralRaptor> Probably
<Fiora> welp and there it is. now i can officially say i work on the apple GPU on the A11 :P
<Fiora> now makes apple officially the uh.... ~5th mobile GPU vendor
<SnoopJeDi> neat
<UmbralRaptor> Today in the future is disappointing: tethering a laptop on a 128k connection to send a png via email to print at a FedEx.
<soundnfury> egg|zzz|egg: having seen your square orbits... when will principia support (or does it already?) linear orbits through toroidal planets?
<SnoopJeDi> UmbralRaptor, I keep a nearly-flush drive plugged into my laptop for pretty much exactly that sort of file-shuffling case :/
<UmbralRaptor> SnoopJeDi: insurance carf
<UmbralRaptor> card
<SnoopJeDi> blagh, insurance
* UmbralRaptor ? the individual mandate in the lack of subsidies for anyone making less than the poverty line.
<kmath> <computerfact> BUTTONS ARE THE PROBLEM WEVE IDENTIFIED THE PROBLEM IT WAS BUTTONS WEVE REMOVED ALL THE BUTTONS WEVE SOLVED THE ALL PROBLEMS COWER BEFORE US
<soundnfury> "perhaps due to an advanced civilization with more aesthetics than sanity" — http://www.aleph.se/andart/archives/2014/02/torusearth.html
<soundnfury> "the cross-section is neither circular nor elliptic but rather egg-shaped"
<SnoopJeDi> That write-up never fails to delight
<SnoopJeDi> which reminds me, I'm reading the last of the Three Body novels at the moment, and it mentions at some point that Trisolaran customs dictate holding special functions at stable (Lagrange) points, which would look Pretty Weird™ for a general three-body system o.O
<soundnfury> SnoopJeDi: these special functions. Are they differentiable?
<SnoopJeDi> hah
<bofh> SnoopJeDi: are they in L^p for any p>=1? :P
<egg|phone|egg> !Wpn Fiora
* Qboid gives Fiora a commuting symmetric inductor
<soundnfury> !wpn egg|phone|egg
* Qboid gives egg|phone|egg a selenium category which vaguely resembles a cannon
<bofh> !wpn egg|phone|egg
* Qboid gives egg|phone|egg a Hitachi breadboard
<bofh> !wpn soundnfury
* Qboid gives soundnfury a cohomology/һοmοɡاурһ hybrid
<bofh> LOL
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<soundnfury> cohomoglyphs, nice!
<soundnfury> !wpn bofh
* Qboid gives bofh a Brillouin theatre
<egg|phone|egg> !u ا
<Qboid> U+0627 ARABIC LETTER ALEF (ا)
<bofh> already got one of those, it's called an X-ray diffractometer
<bofh> /win 20
<kmath> <arclight> I don't regret leaving sysadminnery for legacy radwaste safety analysis. Literal radioactive trash is easier to manage than Windows
<egg|phone|egg> !Wpn whitequark
* Qboid gives whitequark a charm statistic
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<kmath> <Helios748> @innesmck same cat https://t.co/TVqKEB7B6A
* SnoopJeDi ? insurance hoops to jump through to find coverage
* UmbralRaptor hands SnoopJeDi a drawer full of cutlery.
<SnoopJeDi> I'm rather hoping that since it's university insurance that using the university's psychiatric resources counts as in-network but https://i.imgur.com/XsJlZ60.jpg
<egg|phone|egg> Bofh: is Jose turning into where-the-hell-is-Bermuda
<UmbralRaptor> ¯\_?_/¯
<SnoopJeDi> !u ?
<Qboid> U+1F47B GHOST (?)
<kmath> <mhoye> For the latest information about developing for the iPhone X, visit https://t.co/UXM8hPgiqE #AppleEvent #iphoneX
<bofh> egg|phone|egg: yep, apparently. thank, southern jetstream.
<egg|phone|egg> Thetstream.
* soundnfury gives egg|phone|egg a boîte diabolique
<Fiora> bleh. who knows graph algorithms
<soundnfury> Dr. Russell, my old graph theory lecturer AND superviser AND DoS.
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<kmath> <Alex_Parker> I am rapidly running out of office surfaces upon which I can affix sticky notes.
<egg|phone|egg> Fiora: me, a bit, theoretically, but I need to sleep
<G-Mobile> Hang strings from the ceiling
<Fiora> i think i managed it though
<Fiora> i transformed the problem into min-cut!!!
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<egg|phone|egg> Whitequark: random thought: what if you showed котя an anagyre
<Iskierka> ... operserv why are you talking to me
<whitequark> what
<whitequark> what's that
<Iskierka> -OperServ- Services are now running in readonly mode. Any changes you make will not be saved.
<Iskierka> nickserv/chanserv but only accessible to opers for high-level server management
<Iskierka> it does tell me I'm not authorised to use it, but why's it talking to me