proposition: Lemma filter_forall : ∏ A : X → hProp, (∏ x : X, A x) → F A.
proof: Proof. intros A Ha. generalize filter_htrue. apply filter_imply. intros x _. now apply Ha. Qed.
imports: UniMath.Foundations.Preamble UniMath.MoreFoundations.Tactics UniMath.Topology.Prelim UniMath.MoreFoundations.PartA