proposition: Lemma seriesEnat : series = [sequence \sum_(0 <= k < n) u_ k]_n.
proof: Proof. by []. 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