`BookProof.ChapterTimeTranslation.trace_diagPart_measOp` (U : Matrix (Fin n) (Fin n) ℂ) (a : Fin n) (Ψ : Fin n → ℂ) : (diagPart (rho Ψ) * measOp U a).trace = ∑ k : Fin n, (starRing

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`BookProof.ChapterTimeTranslation.trace_diagPart_measOp` (U : Matrix (Fin n) (Fin n) ℂ) (a : Fin n) (Ψ : Fin n → ℂ) : (diagPart (rho Ψ) * measOp U a).trace = ∑ k : Fin n, (starRing · Prove2Me