`BookProof.ChapterLorentzRealRep.castR_mul` (A B : Matrix (Fin 4) (Fin 4) ℤ) : castR (A * B) = castR A * castR B

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`BookProof.ChapterLorentzRealRep.castR_mul` (A B : Matrix (Fin 4) (Fin 4) ℤ) : castR (A * B) = castR A * castR B · Prove2Me