fact: Definition pr1base_of_neighborhood {T : TopologicalSpace} (x : T) : base_of_neighborhood x → ((T → hProp) → hProp) := pr1.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.Topology.Filters UniMath.Algebra.Groups UniMath.Algebra.DivisionRig UniMath.Algebra.ConstructiveStructures