`BookProof.ChapterPinDoubleCover.etaZ_eq_mink` : etaZ = Matrix.of (fun μ ν => minkowskiZ μ ν)

Initializing...

`BookProof.ChapterPinDoubleCover.etaZ_eq_mink` : etaZ = Matrix.of (fun μ ν => minkowskiZ μ ν) · Prove2Me