#[global]
Instance CR_cv_morph
: forall {R : ConstructiveReals} (un : nat -> CRcarrier R), CMorphisms.Proper
(CMorphisms.respectful (CReq R) CRelationClasses.iffT) (CR_cv R un).

Lemma CR_cv_nonneg :
forall {R : ConstructiveReals} (An:nat -> CRcarrier R) (l:CRcarrier R),
CR_cv R An l
-> (forall n:nat, 0 <= An n)
-> 0 <= l.