fact: Definition make_PreFilter {X : UU} (F : (X → hProp) → hProp) (Himpl : isfilter_imply F) (Htrue : isfilter_htrue F) (Hand : isfilter_and F) : PreFilter X := F,, Himpl,, isfilter_finite_intersection_carac F Htrue Hand.
imports: UniMath.Foundations.Preamble UniMath.MoreFoundations.Tactics UniMath.Topology.Prelim UniMath.MoreFoundations.PartA