fact: Definition neighborhood' {T : TopologicalSpace} (x : T) (B : base_of_neighborhood x) : (T → hProp) → hProp := λ P : T → hProp, ∃ O : T → hProp, B O × (∏ t : T, O t → P t).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.Topology.Filters UniMath.Algebra.Groups UniMath.Algebra.DivisionRig UniMath.Algebra.ConstructiveStructures