`BookProof.ChapterTrajectory.midProb_sum` (U : Matrix (Fin n) (Fin n) ℂ) (psi : Fin n → ℂ) (hU : Uᴴ * U = 1) : ∑ a, midProb U psi a = ∑ a, ‖psi a‖ ^ 2

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`BookProof.ChapterTrajectory.midProb_sum` (U : Matrix (Fin n) (Fin n) ℂ) (psi : Fin n → ℂ) (hU : Uᴴ * U = 1) : ∑ a, midProb U psi a = ∑ a, ‖psi a‖ ^ 2 · Prove2Me