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

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