proposition: Lemma closureEcluster E : closure E = cluster (globally E).
proof: Proof. by rewrite closureEnbhs. Qed.
imports: HB(structures) mathcomp(all_ssreflect all_algebra finmap generic_quotient) mathcomp(boolp classical_sets functions) mathcomp(cardinality mathcomp_extra fsbigop) reals signed