proposition: Lemma summableZr (S : T -> R) (c : R) : summable S -> summable (c \o* S).
proof: Proof. by move=> smS; apply/summable_mulrC/summableZ. Qed.
imports: mathcomp(all_ssreflect all_algebra) mathcomp.classical(boolp) xfinmap ereal reals discrete realseq mathcomp.classical(classical_sets functions mathcomp_extra) topology