theorem PiBase.Homeomorph.perfectlyNormalSpace {X : Type u_1} {Y : Type u_2} [TopologicalSpace X] [TopologicalSpace Y] [PerfectlyNormalSpace X] (f : X ≃ₜ Y) : PerfectlyNormalSpace Y

theorem PiBase.WellDefined.perfectlyNormalSpace : WellDefined PerfectlyNormalSpace