`BookProof.ReducedEsa.symmetric_of_involutive_isometry` (hU2 : ∀ x, U (U x) = x) (hUi : ∀ x y : F, (inner ℂ (U x) (U y) : ℂ) = inner ℂ x y) (x y : F) : (inner ℂ (U x) y : ℂ) = inne

Initializing...

`BookProof.ReducedEsa.symmetric_of_involutive_isometry` (hU2 : ∀ x, U (U x) = x) (hUi : ∀ x y : F, (inner ℂ (U x) (U y) : ℂ) = inner ℂ x y) (x y : F) : (inner ℂ (U x) y : ℂ) = inne · Prove2Me