`BookProof.AbelianDiagonal.diagonal_commute` (d e : n → ℂ) : Matrix.diagonal d * Matrix.diagonal e = Matrix.diagonal e * Matrix.diagonal d

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`BookProof.AbelianDiagonal.diagonal_commute` (d e : n → ℂ) : Matrix.diagonal d * Matrix.diagonal e = Matrix.diagonal e * Matrix.diagonal d · Prove2Me