`BookProof.PermSector.purePow_mem_corePow` : ∀ (n : ℕ) (f : Fin n → D₂), (∀ i, ((f i : Hs.carrier)) ∈ D) → purePow (domSpace Hs D₂) n f ∈ corePow Hs D₂ D n

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`BookProof.PermSector.purePow_mem_corePow` : ∀ (n : ℕ) (f : Fin n → D₂), (∀ i, ((f i : Hs.carrier)) ∈ D) → purePow (domSpace Hs D₂) n f ∈ corePow Hs D₂ D n · Prove2Me