proposition: Lemma subset_limit_point E : limit_point E `<=` closure E.
proof: Proof. by move=> t Et U tU; have [p [? ? ?]] := Et _ tU; exists p. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed