fact: Definition filtertop : (X → hProp) → hProp := λ A : X → hProp, make_hProp (∏ x : X, A x) (impred_isaprop _ (λ _, propproperty _)).
imports: UniMath.Foundations.Preamble UniMath.MoreFoundations.Tactics UniMath.Topology.Prelim UniMath.MoreFoundations.PartA