proposition: Lemma is_cvg_esups u : cvgn (esups u).
proof: Proof. by apply/cvg_ex; eexists; exact/cvg_esups_inf. Qed.
imports: mathcomp(all_ssreflect ssralg ssrint ssrnum matrix) mathcomp(interval rat) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(set_interval) reals ereal signed topology normedtype landau