proposition: Lemma cvg_esups_inf u : esups u @ \oo --> ereal_inf (range (esups u)).
proof: Proof. by apply: ereal_nonincreasing_cvgn => //; exact: nonincreasing_esups. 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