proposition: Lemma seriesSB (n : nat) : series n.+1 - series n = u_ n.
proof: Proof. by rewrite seriesS addrK. 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