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`BookProof.ChapterMackeyImprimitivity.mackey_imprimitivity` [DecidableEq X] (S : ImprimitivitySystem G X E) (x₀ : X) (s : X → G) (hs : ∀ x, s x • x₀ = x) : (∀ ψ φ : E, mackeyMap S · Prove2Me