proposition: Lemma cvg_limn_infE u : cvgn u -> limn_inf u = limn u.
proof: Proof. move=> /cvg_ex[l ul]; have [-> _] := cvg_limn_inf_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