proposition: Lemma neighborhood_point : ∏ (x : T) (P : T → hProp), neighborhood x P → P x.
proof: Proof. intros x P. apply hinhuniv. intros O. apply (pr2 (pr2 O)). apply (pr1 (pr2 O)). Qed.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.Topology.Filters UniMath.Algebra.Groups UniMath.Algebra.DivisionRig UniMath.Algebra.ConstructiveStructures