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> 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. | We can haz pdf
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<egg> Eggstreme UV
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<egg|laptop|egg> mlbaker: hm, a symmetric linear map/bilinear form on (V, ⟨_, _⟩) yields one on V∧V as I^: V∧V → V∧V, ω ↦ {I, ω}; I think an eigenbasis of I yields an eigenbasis of I^ under ∧, but how are the eigenvalues of I and I^ related?
<egg|laptop|egg> (where I merrily identify V and V* above, and V∧V and 𝔰𝔬(V), since I gave V an inner product)
<egg|laptop|egg> ah it's just λ1 + λ2 for v1 ∧ v2
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<egg|laptop|egg> INTERNATIONAL EARTH ROTATION AND REFERENCE SYSTEMS SERVICE (IERS)
<egg|laptop|egg> SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE ET DES SYSTEMES DE REFERENCE
<egg|laptop|egg> Paris, 7 January 2020
<egg|laptop|egg> Bulletin C 59
<egg|laptop|egg> To authorities responsible
<egg|laptop|egg> for the measurement and
<egg|laptop|egg> distribution of time
<egg|laptop|egg> INFORMATION ON UTC - TAI
<egg|laptop|egg> NO leap second will be introduced at the end of June 2020.
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<egg|cell|egg> Can that be extended to trivectors?
<mlbaker> i feel like your thing probably just comes from applying the /\^k functor where k=2
<mlbaker> along with the duality identifications you mentioned
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<egg|work|egg> mlbaker: I don't think so?
<egg|work|egg> let v in V be an eigenvector of I in End(V), with eigenvalue λ
<egg|work|egg> then (I∧I)(v∧v) =: Iv∧Iv = λ² v∧v, thus v∧v is an eigenvector of I∧I with eigenvalue λ², rather than 2λ
<egg|work|egg> Another way to look at this is slapping some dimensional analysis on it, the units on I∧I are the square of those on I, where as those on {I, _} are the same
<egg|work|egg> mlbaker: or did I get the definition of I∧I wrong?
<egg|work|egg> OK I'm evidently not awake since v∧v=0, but the same argument holds for, say, v∧w
<egg|work|egg> you get the product of the eigenvalues as the eigenvalue for the wedge of the eigenvectors
<egg|work|egg> rather than the sum
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<egg|work|egg> mlbaker: in particular if V is 2-dimensional, I∧I = det I, whereas {I,_} = tr I
<egg|work|egg> (the underlying motivation here is that if I is (sum over the particles at r of the r_i r_j m), {I, _} is the moment of inertia, and (sum over the particles at r of the r_i r_j m) is a much nicer expression than the one usually given for the moment of inertia (which fails to generalize to dimensions other than 3))
<egg|work|egg> (in particular that I is m r⊗r for a point mass m at r, rather than m (r²𝟙 - r⊗r) for the matrix for {I, _})
<egg|work|egg> !wpn whitequark
* galois gives whitequark an aura with a study attachment
<egg|work|egg> !wpn mlbaker
* galois gives mlbaker a thermonyaacular regular disaster with an aura attachment
<galois> title: "That man was not included in the simulation" on Twitter: "another tragic consequence of someone attempting to pip install without using @anacondainc @pwang… "
<galois> title: Probability Fact on Twitter: ""Monte Carlo is an extremely bad method; it should only be used when all alternative methods are worse." -- Alan Sokal(And often all alternative methods /are/ worse.)"
<SnoopJeDi> 💯
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<galois> title: astro-ph-leaks on Twitter: "don't complain about overfull hboxes!"
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<_whitenotifier-d13c> [Principia] eggrobin opened pull request #2436: Bulletin C 59 - https://git.io/Jveso
<egg|laptop|egg> rqou: there's a train to Zurich, you could come here :-p https://twitter.com/rqou_/status/1214630013754073088
<galois> title: Robert Ou @ Vienna on Twitter: "RIP time to start leaving Europe :( :(… "
<_whitenotifier-d13c> [Principia] pleroy labeled pull request #2436: Bulletin C 59 - https://git.io/Jveso
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4079/
<_whitenotifier-d13c> [Principia] Success. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4079/
* egg|laptop|egg pokes mofh and mlbaker with an anticommutator
<egg|laptop|egg> {mofh, mlbaker}
<_whitenotifier-d13c> [Principia] eggrobin closed pull request #2436: Bulletin C 59 - https://git.io/Jveso
<_whitenotifier-d13c> [Principia] eggrobin pushed 3 commits to master [+0/-0/±8] https://git.io/JveGx
<_whitenotifier-d13c> [Principia] eggrobin f8f2fdb - NO leap second will be introduced at the end of June 2020.
<_whitenotifier-d13c> [Principia] eggrobin ea32b8d - Earth orientation parameters.
<_whitenotifier-d13c> [Principia] eggrobin 0596c8f - Merge pull request #2436 from eggrobin/bulletin-c-59 Bulletin C 59
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<egg|laptop|egg> !wpn
* galois gives egg|laptop|egg a semiregular cyclotron
* egg|laptop|egg pokes mofh with the cyclotron
* SnoopJeDi stares in EH&S
<egg|laptop|egg> EH&S?
<SnoopJeDi> !acr -add:EH&S Environmental Health & Safety
<galois> Definition added!
<egg|laptop|egg> !wpn -add:adj safe
<galois> Entry already exists!
<egg|laptop|egg> !wpn -add:adj healthy
<galois> Added adj 'healthy'
<SnoopJeDi> cyclotrons being generally radioactive things which might not be good for poking
<SnoopJeDi> !wpn egg|laptop|egg
* galois gives egg|laptop|egg an Einstein tardigrade with a diode attachment
* egg|laptop|egg pokes the tardigrade with the cyclotron
<SnoopJeDi> imagining a tardigrade with a puff of grey hair and a bushy mustache
<UmbralRaptop> !wpn
* galois gives UmbralRaptop a singular tissue
<egg|laptop|egg> SnoopJeDi: but what about 1904 Einstein https://www.ige.ch/fileadmin/user_upload/ueber_uns/einstein/img/Einstein.jpg
<SnoopJeDi> I was thinking of an elderstein because tardigrades are so nearly eternal
<SnoopJeDi> probably
<SnoopJeDi> !wpn UmbralRaptop
* galois gives UmbralRaptop a purple t-test
<egg|laptop|egg> !wpn
* galois gives egg|laptop|egg a fermium Джанибеков cat with a saber attachment
<egg|laptop|egg> tumbling cat
<SnoopJeDi> UmbralRaptop, so I hadn't heard about this "maybe the Ia supernovae observations were biased and dark energy doesn't real" paper until today o.O
<UmbralRaptop> o_O
<galois> ¯\_(ツ)_/¯
<egg|laptop|egg> UmbralRaptop: SnoopJeDi: yeah I linked a manley tweet about it yesterday https://esper.irclog.whitequark.org/kspacademia/2020-01-06#2566873;
<galois> title: #kspacademia on 2020-01-06 — irc logs at whitequark.org
<SnoopJeDi> ahh
<galois> title: [1912.04903] Early-type Host Galaxies of Type Ia Supernovae. II. Evidence for Luminosity Evolution in Supernova Cosmology
<SnoopJeDi> okay, there we go
<SnoopJeDi> apparently lxml.html doesn't support explicit encoding declarations inside of unicode contents