proposition: Lemma cvgNy_einfs u : u @ \oo --> -oo -> einfs u @ \oo --> -oo.
proof: Proof. move=> /cvgNy_limn_einf_sup[uoo _]. apply/cvg_closeP; split; [exact: is_cvg_einfs|rewrite closeE//]. by rewrite -limn_einf_lim. 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