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`BookProof.ChapterConservative.timeEvo_conj_trace` (H : Matrix n n ℂ) (hH : H.IsHermitian) (t : ℝ) (ρ : Matrix n n ℂ) : (timeEvo H t * ρ * (timeEvo H t)ᴴ).trace = ρ.trace · Prove2Me