#[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 growing_ineq : forall {R : ConstructiveReals} (Un:nat -> CRcarrier R) (l:CRcarrier R), (forall n:nat, Un n <= Un (S n)) -> CR_cv R Un l -> forall n:nat, Un n <= l.