proposition: Lemma cvg_einfs u l : u @ \oo --> l -> einfs u @ \oo --> l.
proof: Proof. move=> /cvgeN/cvg_esups/cvgeN; rewrite oppeK esupsN. by under eq_cvg do rewrite /= oppeK. 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