`BookProof.ChapterLorentzRealRep.gram_halfR` : ∀ i j : Fin 4, ((bHalfR i)ᵀ * bHalfR j).trace = if i = j then (4 : ℝ) else 0

Initializing...

`BookProof.ChapterLorentzRealRep.gram_halfR` : ∀ i j : Fin 4, ((bHalfR i)ᵀ * bHalfR j).trace = if i = j then (4 : ℝ) else 0 · Prove2Me