`BookProof.ChapterMackeyImprimitivity.ImprimitivitySystem.U_inv_apply` (g : G) (ψ : E) : S.U g⁻¹ (S.U g ψ) = ψ

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`BookProof.ChapterMackeyImprimitivity.ImprimitivitySystem.U_inv_apply` (g : G) (ψ : E) : S.U g⁻¹ (S.U g ψ) = ψ · Prove2Me