proposition: Lemma isaprop_continuous (x y : TopologicalSpace) (f : x → y) : isaprop (continuous (λ x0 : x, f x0)).
proof: Proof. do 3 (apply impred_isaprop; intro). apply propproperty. Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.Topology.Filters UniMath.Algebra.Groups UniMath.Algebra.DivisionRig UniMath.Algebra.ConstructiveStructures