`BookProof.DensitySpectral.isDensityMatrix_of_unitary_diagonal` (U : Matrix.unitaryGroup n ℂ) (d : n → ℝ) (hd : ∀ i, 0 ≤ d i) (hsum : ∑ i, d i = 1) : IsDensityMatrix ((U : Matrix n

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`BookProof.DensitySpectral.isDensityMatrix_of_unitary_diagonal` (U : Matrix.unitaryGroup n ℂ) (d : n → ℝ) (hd : ∀ i, 0 ≤ d i) (hsum : ∑ i, d i = 1) : IsDensityMatrix ((U : Matrix n · Prove2Me