`BookProof.PermSector.signRep_mem_sectorCore` (n : ℕ) (σ : Equiv.Perm (Fin n)) (x : (Hs.pow n).carrier) (hx : x ∈ sectorCore Hs D₂ D n) : (signRep Hs n).act σ x ∈ sectorCore Hs D₂

Initializing...

`BookProof.PermSector.signRep_mem_sectorCore` (n : ℕ) (σ : Equiv.Perm (Fin n)) (x : (Hs.pow n).carrier) (hx : x ∈ sectorCore Hs D₂ D n) : (signRep Hs n).act σ x ∈ sectorCore Hs D₂ · Prove2Me