`BookProof.ChapterLorentzRealRepSum.gram_all` : ∀ i j : Fin 14, ((bAll i)ᵀ * bAll j).trace = if i = j then 4 else 0

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`BookProof.ChapterLorentzRealRepSum.gram_all` : ∀ i j : Fin 14, ((bAll i)ᵀ * bAll j).trace = if i = j then 4 else 0 · Prove2Me