proposition: Lemma is_cvg_npeseries P N : (forall n, P n -> u_ n <= 0) -> cvgn (fun n => \sum_(N <= i < n | P i) u_ i).
proof: Proof. by move=> ?; exact: is_cvg_npeseries_cond. 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