`BookProof.ChapterAbelianVonNeumannFinite.commutes_diagonal_iff` (e : n → ℂ) (he : Function.Injective e) (M : Matrix n n ℂ) : M * diagonal e = diagonal e * M ↔ ∃ d : n → ℂ, M = dia

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`BookProof.ChapterAbelianVonNeumannFinite.commutes_diagonal_iff` (e : n → ℂ) (he : Function.Injective e) (M : Matrix n n ℂ) : M * diagonal e = diagonal e * M ↔ ∃ d : n → ℂ, M = dia · Prove2Me