proposition: Lemma sub_setring : G `<=` <<r G >>.
proof: Proof. exact: sub_smallest. Qed.
imports: mathcomp(all_ssreflect all_algebra finmap) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(cardinality fsbigop ) reals ereal signed topology normedtype sequences esum numfun HB(structures)