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`BookProof.ReducedEsa.isReducingProjection_asymProj` (hU2 : ∀ x, U (U x) = x) (hUi : ∀ x y : F, (inner ℂ (U x) (U y) : ℂ) = inner ℂ x y) : IsReducingProjection (asymProj U) where i · Prove2Me