proposition: Lemma is_cvg_limn_esupE u : cvgn u -> limn_esup u = limn u.
proof: Proof. move=> /cvg_ex[l ul]; have [_ ->] := cvg_limn_einf_sup ul. by move/cvg_lim : ul => ->. 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