proposition: Lemma nbhs_dnbhs_neq {T : topologicalType} (p : T) : \forall x \near nbhs p^', x != p.
proof: Proof. exact: withinT. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed