proposition: Lemma lim_seriesB f g : cvg (series f @ \oo) -> cvg (series g @ \oo) -> limn (series (f - g)) = limn (series f) - limn (series g).
proof: Proof. by move=> Cf Cg; rewrite lim_seriesD ?is_cvg_seriesN// lim_seriesN. 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