proposition: Lemma CRabs_wd : Proper (@msp_eq CR ==> @msp_eq CR) CRabs.
proof: Proof. intros x y xyeq. apply Cmap_wd. reflexivity. rewrite xyeq. reflexivity. Qed.
imports: CoRN.algebra.RSetoid CoRN.metric2.Metric CoRN.metric2.UniformContinuity CoRN.model.totalorder.QposMinMax CoRN.reals.fast.CRArith CoRN.model.metric2.Qmetric Coq.QArith.Qabs CoRN.model.totalorder.QMinMax CoRN.logic.Stability