proposition: Lemma cvg_entourageP F (FF : Filter F) (p : M) : F --> p <-> forall A, entourage A -> \forall q \near F, A (p, q).
proof: Proof. by rewrite -filter_fromP !nbhs_simpl. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed