proposition: Lemma cvgy_einfs u : u @ \oo --> +oo -> einfs u @ \oo --> +oo.
proof: Proof. move=> /cvgeN/cvgNy_esups/cvgeN; rewrite 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