Section Properties1.
Context {K : AbsRing} {V : NormedModule K}.
(** Extensionality *)
(** Index offset *)
End Properties1.

Lemma Series_incr_n (a : nat -> R) (n : nat) :
(0 < n)%nat -> ex_series a
-> Series a = sum_f_R0 a (pred n)  + Series (fun k => a (n + k)%nat).