proposition: Lemma eseriesD (f g : (\bar R)^nat) : eseries (f \+ g) = eseries f \+ eseries g.
proof: Proof. by rewrite /eseries /= funeqE => n; rewrite big_split. 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