`BookProof.PermSector.permOp_mem_sectorDom` (n : ℕ) (σ : Equiv.Perm (Fin n)) {x : (Hs.pow n).carrier} (hx : x ∈ sectorDom Hs D₂ n) : permOp Hs n σ x ∈ sectorDom Hs D₂ n

Initializing...

`BookProof.PermSector.permOp_mem_sectorDom` (n : ℕ) (σ : Equiv.Perm (Fin n)) {x : (Hs.pow n).carrier} (hx : x ∈ sectorDom Hs D₂ n) : permOp Hs n σ x ∈ sectorDom Hs D₂ n · Prove2Me