proposition: Lemma cvg_geometric (R : archiFieldType) (a z : R) : `|z| < 1 -> geometric a z @ \oo --> (0 : R).
proof: Proof. by move=> /cvg_geometric_series/cvgP/cvg_series_cvg_0. 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