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.
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<GreeningGalaxy> !wpn egg|phone|egg
* Qboid gives egg|phone|egg an axiom with an explosion attachment
<GreeningGalaxy> ;mission
<kmath> GreeningGalaxy: You just sit there and spam ;mission. Jebediah reveals he didn't kill your father, he IS your father!
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<BudgetRaptor> ;mission
<kmath> BudgetRaptor: Disappointed with the burn speed of conventional solid boosters, you decide to load yours with pure RDX. Riots at KSC.
<BudgetRaptor> ...RDX? What sort of n00b does kmath take me for?
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<UmbralRaptor> My SRBs use octanitrocubane, thankyouverymuch.
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<egg|phone|egg> !Wpn UmbralRaptor
* Qboid gives UmbralRaptor a numerical 
<egg|zzz|egg> uh
<egg|zzz|egg> !wpn bofh_
* Qboid gives bofh_ a superconducting dynamo/shell hybrid
* egg|zzz|egg pokes bofh_ in the underscore
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<egg|coffee|egg> aaaaargh we didn't make a release named after ಭಾಸ್ಕರ ೨ and now we're past the B releases and I don't think there's another mathematician whose name should be written in Kannada
egg|coffee|egg is now known as egg
<egg> Mathematica why are you so unstable
<egg> !tell UmbralRaptor a nutty topography doesn't yield an equally nutty potential http://i.imgur.com/Wji1h5x.png
<Qboid> egg: I'll redirect this as soon as they are around.
* UmbralRaptor x_x
<Qboid> UmbralRaptor: egg left a message for you in #kspacademia [28.03.2017 11:20:19]: "a nutty topography doesn't yield an equally nutty potential http://i.imgur.com/Wji1h5x.png"
<egg> !wpn UmbralRaptor
* Qboid gives UmbralRaptor a cetacean down flail
<UmbralRaptor> !wpn egg
* Qboid gives egg a Norman meganeuropsis
<egg> UmbralRaptor: two homogeneous tangent spheres, their field, and the local slope
<egg> UmbralRaptor: the field isn't *that* nutty, mostly it points to the centre; where it is nutty the neck would probably fill up anyway
<egg> UmbralRaptor: amusing property: it's downhill to the neck from almost anywhere
<egg> UmbralRaptor: slope > 45 deg in red, > 60 in purple, otherwise gradient from black = horizontal to a pink of sorts
<egg> UmbralRaptor: so I guess it's not entirely unreasonable to slap it with harmonics?
<UmbralRaptor> I guess?
<egg> UmbralRaptor: also I am mildly stuck on API design for vessel-centred trajectories in Cartan >_>
<egg> serialization is hard
<egg> so in the meantime I plot potentials :-p
* UmbralRaptor sets a lagrange point on a horse.
<egg> hah
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<egg> !wpn Thomas
* Qboid gives Thomas a giant walnut
<egg> !wpn ferram4
* Qboid gives ferram4 an iodine snail
<egg> !wpn UmbralRaptor
* Qboid gives UmbralRaptor a ⅝λ cup of tea
<egg> !wpn whitequark
* Qboid gives whitequark an IEEE 488 snakehead
<UmbralRaptor> !wpn egg
* Qboid gives egg a monopolar histomorphism
<UmbralRaptor> !wpn HARPS
* Qboid gives HARPS an Agile fuse
<egg> HARPS?
<Qboid> egg: [HARPS] => High Accuracy Radial velocity Planet Searcher
<UmbralRaptor> NIRPS?
<Qboid> UmbralRaptor: [NIRPS] => Near Infra Red Planet Searcher
<UmbralRaptor> \o/
<bofh_> egg: ?
<egg> bofh_: ?
<bofh_> also a superconducting dynamo/shell hybrid, just what I always needed :D
<bofh_> 08:12:38 * egg|zzz|egg pokes bofh_ in the underscore
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<egg> well you had an underscore
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<egg> UmbralRaptor: wondering whether "perinaus" could be used for "closest approach to a vessel" >_>
<egg> !u ?
<Qboid> U+10019 LINEAR B SYLLABLE B006 NA (?)
<SnoopJeDi> TIL vim has digraphs
<egg> !wpn SnoopJeDi
* Qboid gives SnoopJeDi an egotistical proof
<SnoopJeDi> strangely apropos
<egg> SnoopJeDi: ?
<SnoopJeDi> egg, I would describe my ego as a major limiter on my ability to learn anything :P
<UmbralRaptor> SnoopJeDi: shiny!
<SnoopJeDi> wossat, UmbralRaptor?
<UmbralRaptor> The digraphs
<SnoopJeDi> oh, yea! CTRL-K {char1} {char2}, and apparently there's a `digraph` option that allows you do to {char1} <BS> {char2}
<SnoopJeDi> I use a compose key app for Windows already so it's not super helpful to me, but still neato
<bofh> !wpn SnoopJeDi
* Qboid gives SnoopJeDi a dubious radius
<egg> !wpn bofh
* Qboid gives bofh a hypothetical equivalence
<bofh> is a dubious radius sort of like a sketchy semi-major axis?
<SnoopJeDi> it's the sort of fantasy thing τ zealots believe in
<UmbralRaptor> A dubious radius is what we have for most KBOs and RV eggsoplanets.
<egg> hah
<egg> UmbralRaptor: hmm, I wonder whether the TRAPPIST-1 system would be interesting to have in KSP+principia
<egg> UmbralRaptor: though perhaps it would be a bit boring without moons?
<egg> hmm, quite enough planets though and close to each other
<egg> fast years too >_>
<UmbralRaptor> probably. But poke gregroxmun about his SLIPPIST kerbalfied variant?
<egg> UmbralRaptor: huh, that's a thing
<SnoopJeDi> You lot know lots of sciences, if you can think of anybody that might fit on this list, do tell: https://gist.github.com/SnoopJeDi/6fa0dd1bb917c6528910ada48e15d5f7
<egg> UmbralRaptor: so I guess it's just a matter of putting in the actual numbers rather than the kerbalified ones now
<UmbralRaptor> probably
<UmbralRaptor> SnoopJeDi: Emily Lakdawalla?
<SnoopJeDi> Not familiar, but onto the list she goes!
<UmbralRaptor> I'd skim the Planetary Society for people that may be relevant.
<egg> SnoopJeDi: not familiar? but how do you know about cerean ice weasels then
<SnoopJeDi> c-cerean ice weasels?
<UmbralRaptor> Alex Parker is also to blame for that.
<egg> UmbralRaptor: I think it starts with this thread https://twitter.com/PlanetDr/status/571475419133833217
<kmath> <PlanetDr> @elakdawalla @lukedones @otherorbscience and with that the Cerean ice weasels joined the pantheon of fictional planetary creatures.
<SnoopJeDi> ooh and Vi Hart should be on there
<kmath> <PlanetDr> Pluto apparently also as Cerean ice weasels (ice weasel panspermia?) http://t.co/NTIp0w93O1
<SnoopJeDi> (we do maths stuff, too, our MIST building has a Penrose tiling on the floor)
<kmath> <AstroKatie> But the Cerean ice weasels are totally real. https://t.co/EK8XeQ5iDk
<SnoopJeDi> ((which reminds me, I should write and actually finish a Penrose tiling generator))
<kmath> <Alex_Parker> @elakdawalla @PlanetDr @lukedones @OtherOrbScience I should be writing. http://t.co/Yb4qTTUbSe
<kmath> <PlanetDr> The real question is, are the LHC weasel and the Cerean ice weasels genetically related https://t.co/M7eN9wGcQJ
<kmath> <elakdawalla> Hmm. The Cerean ice weasels seem to have woodpecker-shaped fighter craft with lasers and VTOL capability. Dangerous… http://t.co/kBxBC2FQDy
<SnoopJeDi> ooh AstroKatie definitely needs to be on the list
<egg> !wpn whitequark
* Qboid gives whitequark a Аэрофло́т glider
* whitequark stares at egg
<whitequark> accent marks again
<whitequark> also, an Аэрофлот glider sounds like a narrowly avoided incident
<egg> whitequark: I think that was UmbralRaptor who added it
<egg> whitequark: I tend to not add accent marks
<egg> whitequark: I think specifically UmbralRaptor added it while I was telling tales of missed SVO connections
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<egg> whitequark: any idea why clang treats floating point infinities in constexpr as errors?
<egg> that prevents our InfinitePast and InfiniteFuture Instants from being constexpr :-\
<whitequark> egg: try #llvm
<whitequark> at irc.oftc.net
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<bofh> egg: InfinitePast/InfiniteFuture?
<egg> also whitequark in case you're wondering what it's all about ^
<egg> CONSTEXPR_INFINITY being a conditional constexpr because of that
<egg> Iskierka: also you have been thanked http://forum.kerbalspaceprogram.com/index.php?/topic/62205-wip122-principia-version-cardano-released-2016-03-28-n-body-and-extended-body-gravitation/&page=26#comment-3000707
<egg> and this month has something to do with deers apparenthly
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<egg> !wpn GreeningGalaxy
* Qboid gives GreeningGalaxy a pi terminal which strongly resembles a 2N2222
* egg gives GreeningGalaxy a bacon jam tomato sandwich
<egg> (tbh that doesn't sound appealing)
<egg> TRAPPIST?
<Qboid> egg: [TRAPPIST] => TRAnsiting Planets and PlanetesImals Small Telescopes
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<whitequark> !wpn egg
* Qboid gives egg a Euclidean superuser
<whitequark> !wpn GreeningGalaxy
* Qboid gives GreeningGalaxy a Белинский DIAC with a geobukseon attachment
<egg> Белинский!
<egg> continued fractions and cosmology! \o/ \o/ \o/
<egg> bofh: the BKL singularity is cool
<kmath> <whitequark> email clients should just have the default template start with "Sorry for the delayed response,"
* egg always takes ages to write a mail for some reason
<egg> and therefore procrastinates replying....
<bofh> egg: [[Citation Needed]]
<egg> bofh: ?
<bofh> 19:38:13 <@egg> bofh: the BKL singularity is cool
<egg> bofh: well the numbers of oscillations are given by continued fractions
<egg> how is that not cool
<bofh> how nasty are those continued fractions anyhow?
<egg> bofh: what do you mean
<egg> define nasty for a continued fraction :-p
<bofh> "evaluation via Lentz or Modified Lentz method exhibits linear or worse convergence"
<bofh> :P
<bofh> (really any method, but I've yet to find anything more numerically stable than Modified Lentz)
<egg> bofh: yeah, they're probably numerically hell
<egg> bofh: but you can *prove* that (the homogeneous spacetimes at least) have numbers of oscillations given by those continued fractions
<egg> that has to be cool
<egg> bofh: arguably they're singularities, so they're probably hell IRL too, as well as numerically :-p
<egg> especially since they're highly oscillatory
<bofh> oh, ew.
<egg> is hell oscillatory
<bofh> GLHF evaluating those numerically
<bofh> well Bessel functions are hell, so I'd say yes
<egg> bofh: see the numbers of cycles per era are given by continued fraction expansions of the initial conditions
<kmath> YouTube - Hitler learns Jackson E&M
<egg> bofh: whitequark: I'm not familiar with that book (though arguably at ETH we're really not textbook-heavy; the americans in the channel seem to be very into textbooks)
<bofh> whitequark: ROFL
<egg> 2MASS?
<Qboid> egg: [2MASS] => Two Micron All Sky Survey
<bofh> whitequark: oh my god I laughed so hard my officemates all gave me weird looks
<bofh> "if you're uncomfortable with spherical Bessel functions, leave the room now"
<egg> !acr -add:2MUCD 2MASS UltraCool Dwarf
<Qboid> egg: I added the explanation for this acronym.
<bofh> "NO I CAN'T "JUST LOOK" AND SEE THE ANSWER! DO I LOOK LIKE FEYNMAN TO YOU?!?"
<egg> bofh: physics textbooks and maths textbooks seem to be a different kind of madness
<egg> bofh: in mathematics it's more "once you've read the thing you know the prerequisites to read it"
<egg> !wpn
* Qboid gives egg a sinusoidal snakehead with a solenoid attachment
<egg> !wpn -add:adj Bessel
<Qboid> egg: Adjective added!
<egg> bofh: oh I'm coming across the identifiers ṙ and r̈ again :D
<SnoopJeDi> I love Jackson for the sheer reason that nothing else I'm aware of can make a room full of PhD-holding physicists cringe quite like referencing a particular derivation in Jackson
<SnoopJeDi> I contend that the SI unit of suffering is the milliJackson
<bofh> I concur.
<egg> (Wedge(r, r̈) * Radian - 2 * ω * InnerProduct(r, ṙ)) / InnerProduct(r, r);
<egg> :D
<egg> bofh: note that we use operator* for the application of a bivector to a vector, because they're morally just matrices
<egg> so we use * for the cross product in a way :-p
<egg> (but for the inner product we use InnerProduct, because that's *not* composition/multiplication, unless you identify a vector with the corresponding linear form)
<bofh> oh I assume we're not working in a Hilbert space?
<egg> bofh: we are tbh
<egg> bofh: it's just that I find it morally wrong to write the inner product like matrix multiplication
<egg> whereas it is natural to do so for the "cross product" between a bivector and a vector
<bofh> oh in that case just (ab)use Riesz Representation to view it as vector-vector multiplication of a vector with the dual of another vector
<egg> (between vectors, yielding a bivector, it is Wedge, not * of course)
<bofh> okay good
<egg> bofh: which means that the above formula is just a classic computation of angular acceleration
<egg> where r with various numbers of dots are the derivatives of the separation
<egg> !u r̈
<Qboid> U+0072 LATIN SMALL LETTER R (r)
<Qboid> U+0308 COMBINING DIAERESIS (◌̈)
<egg> combining chars in identifiers :-p
<egg> bofh: and yeah, I know, I could use Riesz and write all that (except the Wedge) *, but still >_>
<bofh> true
<egg> bofh: also I'd need to be very careful with associativity
<bofh> well floating-point is already not very associative so
<egg> no, but I mean the abstract operations would be messy in that regard
<egg> bofh: because if I identified the vector and the linear form, 2 * ω * r * ṙ would be a scalar and 2 * ω * (r * ṙ) would be a bivector
<egg> that seems evil
<egg> whereas here the former is legal and a scalar, the latter has no operator for (r * ṙ)
<bofh> LOL
<egg> bofh: yeah, great isomorphisms theorems should come with caveats about the things you'll break if you use them :-p
<egg> bofh: also if the operator precedence of ^ weren't all wrong I could overload it for wedge (but it's below addition so that's bad)
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<soundnfury> egg: with great isomorphism theorems comes great responsibility?
* soundnfury gets coat
<egg> soundnfury: you are getting https://en.wikipedia.org/wiki/Tur%C3%A1n's_theorem#Mantel.27s_theorem from https://fr.wikipedia.org/wiki/Th%C3%A9or%C3%A8me_porte-manteau ?
<egg> bofh: translingual math puns!
<soundnfury> egg: so why is it called the portmanteau theorem? Does it pack two theorems into one?
<soundnfury> ("When _I_ state a theorem", said the egg, "it proves precisely what I want it to prove - nothing more, nothing less.")
<egg> soundnfury: apparently it's not known why it bears this name
<egg> also I didn't know the name, because I haven't learned stats in french
<soundnfury> also, google translates porte-manteau as "coathanger", which makes me sad
<soundnfury> because portmanteau is a loanword, which is a calque, which is a loanword.
<egg> soundnfury: yes, it's pretty transparent, it's coat-bearer (or a coat-wearer or a coat-holder or something, porter translates to many things)
<soundnfury> yes but a porte-manteau is a kind of luggage or valise. A coathanger is a bit of bent metal. These are not the same concept.
<egg> soundnfury: nono, it's not luggage, it's a coat rack
<egg> soundnfury: and the bit of bent metal is a cintre
<soundnfury> egg: ok, in that case we mangled it when we stole it
<soundnfury> because in English, the meaning of "portmanteau" is (at least according to Wiktionary) "A large travelling case usually made of leather, and opening into two equal sections"
<egg> soundnfury: clearly that's because you needed to get away quickly when you stole the word; a coat rack would have been too cumbersome
<soundnfury> perhaps
<soundnfury> Träger des Mantels
<soundnfury> !wpn egg
* Qboid gives egg a cathode graviton rotor
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<egg> !wpn GreeningGalaxy
* Qboid gives GreeningGalaxy a high-voltage furious-sounding cult
<SnoopJeDi> Iä! Iä!
<soundnfury> !wpn SnoopJeDi
* Qboid gives SnoopJeDi a vegetable tea
<soundnfury> (also, egg fhtagn)
* egg tilts the universe
<soundnfury> you can only hope for one thing: _to be eaten symplectically_
<SnoopJeDi> A nice cucumber tea does sound nice, but cucumber's a fruit innit?
<soundnfury> is it?
* soundnfury can never remember how the fruit vs. vegetable definitions work, they're craxy
<egg> soundnfury: perhaps only conjugate-symplectically
<egg> or conjugate-eaten, too
<whitequark> who has eaten the conjugate
<soundnfury> cowhitequark coeats /me
<SnoopJeDi> "Jermyn et al. (1) have developed a hand held contact Raman Spectroscopy probe technique which can differentiate normal and invasive cancer cells in the brain."
<regex> woooooo! First Go program, and it works!
<regex> (Go lang, not the game)
<SnoopJeDi> so begins the quickening
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<egg> UmbralRaptor: wait there's a university of missouri, a university of missouri kansas city, and a missouri state university? wtf
<egg> also MSU clashes acronyms with whitequark
<whitequark> MSU?
<egg> whitequark: apparently Qboid knows neither
<whitequark> bofh: lol "home despot"
<whitequark> I know a few people like that
<SnoopJeDi> "ValueError: operands could not be broadcast together with shapes (3,100,50,25) (3,)"
<SnoopJeDi> It doesn't appear to matter how much time I spend with numpy, I still don't actually understand broadcasting rules
<SnoopJeDi> oh, the dimensions have to "line up," I needed a transpose
<bofh> SnoopJeDi: ahh, numpy errors. may I suggest reading tea leaves?
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<SnoopJeDi> bofh, should elucidate things a bit better than reading the docs
<egg> bofh: or coffee grounds
<egg> Majiir: tilt!
<egg> Majiir: the new moon has come, and with it came tilt!
<Majiir> tilt??
<kmath> <eggleroy> ?Cardano, the new release of Principia, is out, targeting KSP 1.2.2, and bringing with it axial tilt. https://t.co/5J2mNCOLFh
<egg> Majiir: and also the beginning of lunar releases
<egg> because clearly a new release every new moon is a perfectly sane idea
<Majiir> nOICE!
<soundnfury> egg: I always said you were a lunatic.
<egg> Majiir: also, since it's profoundly tied to our thing and people tend to want tilt, incentivising people to use n-body gravitation :D
egg is now known as egg|paradoxical|egg
<egg|paradoxical|egg> > (egg :: Egg) == egg
<Soozee> False
<egg|paradoxical|egg> blame Majiir
<egg|paradoxical|egg> > (egg :: Integer) == egg
<Soozee> mueval-core: Time limit exceeded
egg|paradoxical|egg is now known as egg|NaN|egg
egg|NaN|egg is now known as egg
<UmbralRaptor> egg: There are a lot of schools with "Missouri" in their names. >_>
<UmbralRaptor> Multiple school systems at that!
<egg> aaaaa
<UmbralRaptor> 10 public, and 3 private.
<egg> UmbralRaptor: no protected?
<egg> >_>
<egg> UmbralRaptor: does Missouri have friends
<UmbralRaptor> Is this a C thing?
<bofh> soundnfury: so based on what I know about camels, being eaten symplectically sounds painful
<egg> UmbralRaptor: C++
<UmbralRaptor> I'm fairly certain that eating is incompatable with symplecticity(sp?)
<kmath> <whitequark> so you all hate on C++. all right. all right. tell me. does your favorite language have a concept of friendship, then? eh? thought so.
<UmbralRaptor> Well, okay, maybe energy is conserved. But the process is far from isentropic!
<egg> UmbralRaptor: (also see the reply thread)
* UmbralRaptor stares at @atax1a's reply.
<soundnfury> UmbralRaptor: not so! If you 'watch what you eat', you can avoid losing any information about it
<UmbralRaptor> (Members? plural? o_O)
<egg> UmbralRaptor: so, context: friends of a class in C++ can access its private members
<egg> without being related to it
<UmbralRaptor> ah
<Majiir> > (1 :: Egg) == ("lololol" :: Egg)
<Majiir> Awh.
<Majiir> I guess that's compile-time
<egg> https://twitter.com/dbennett_ks/status/756870682227662848 <<< this is a lie! also that's improperly capitalized! bad!
<kmath> <dbennett_ks> @whitequark @thegrugq ADA.
<egg> the private part is at the package level
<egg> so private things can see each other, you can have several private types and everything private will see into those types
<egg> but you don't have friendship!
<egg> another package won't see your private part!