`BookProof.AbelianDiagonal.commutant_diagonal_eq_diagonal` (M : Matrix n n ℂ) (h : ∀ d : n → ℂ, M * Matrix.diagonal d = Matrix.diagonal d * M) : M = Matrix.diagonal (fun i => M i i

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`BookProof.AbelianDiagonal.commutant_diagonal_eq_diagonal` (M : Matrix n n ℂ) (h : ∀ d : n → ℂ, M * Matrix.diagonal d = Matrix.diagonal d * M) : M = Matrix.diagonal (fun i => M i i · Prove2Me