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

theorem PiBase.WellDefined.frechetUrysohnSpace : WellDefined FrechetUrysohnSpace