`BookProof.ReducedEsa.isReducingProjection_symProj` (hU2 : ∀ x, U (U x) = x) (hUi : ∀ x y : F, (inner ℂ (U x) (U y) : ℂ) = inner ℂ x y) : IsReducingProjection (symProj U) where ide

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`BookProof.ReducedEsa.isReducingProjection_symProj` (hU2 : ∀ x, U (U x) = x) (hUi : ∀ x y : F, (inner ℂ (U x) (U y) : ℂ) = inner ℂ x y) : IsReducingProjection (symProj U) where ide · Prove2Me