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`BookProof.ChapterSirkPerSystemFlowBound.adjoint_comp_self_of_isometry` (V : G →L[ℂ] E) (hV : ∀ x : G, ‖V x‖ = ‖x‖) : V.adjoint.comp V = ContinuousLinearMap.id ℂ G · Prove2Me