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`BookProof.SymmetryEntropy.isDeterministicCol_iff_entropy_eq_zero` {U : Fin n → Fin n → ℂ} {a : Fin n} (hcol : ∑ k, ‖U k a‖ ^ 2 = 1) : IsDeterministicCol U a ↔ entropy (bornCol U a · Prove2Me