`BookProof.ChapterA3.toC_mul` (M N : Matrix (Fin 4) (Fin 4) ℝ) : toC (M * N) = toC M * toC N

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`BookProof.ChapterA3.toC_mul` (M N : Matrix (Fin 4) (Fin 4) ℝ) : toC (M * N) = toC M * toC N · Prove2Me