Definition series_cv_abs {R : ConstructiveReals} (u : nat -> CRcarrier R)
: CR_cauchy R (CRsum (fun n => CRabs R (u n)))
-> { l : CRcarrier R & series_cv u l }.

Lemma CRmorph_series_cv : forall {R1 R2 : ConstructiveReals}
(f : @ConstructiveRealsMorphism R1 R2)
(un : nat -> CRcarrier R1)
(l : CRcarrier R1),
series_cv un l
-> series_cv (fun n => CRmorph f (un n)) (CRmorph f l).