egg changed the topic of #principia to: Logs: https://esper.irclog.whitequark.org/principia | <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/ | <egg> calculating the influence of lamont on Pluto is a bit silly…
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<queqiao->
⟨egg⟩ Hm, is the IRC bridge still up?
<queqiao->
⟨egg|matrix|egg⟩ Looks like it went down for a while but now it is back up.
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ Have a cat picture, raptop.
* raptop
meows at the good tuxxy
<queqiao->
⟨Paculino (ŝi/ri/she/they)⟩ She kept moving too fast to photograph well
<queqiao->
⟨Standecco⟩ you did guess correctly that it was about electrons, but it's not strictly numerical; it's in BCS theory of superconductivity, where \mathcal{E} is the usual electron energy, ξ is the electron energy w.r.t. the Fermi level, E is the energy of an excited electron quasi-particle, and ϵ is the gap energy (often also called Δ)