proposition: Lemma eseriesS n : eseries n.+1 = u_ n + eseries n.
proof: Proof. by rewrite addeC eseriesSr. 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