fact: Definition CR_b (e:Qpos) (x:CR) : Qpos := exist (Qlt 0) (Qabs (approximate x e) + proj1_sig e) (CR_b_pos _ _).
imports: CoRN.metric2.Metric CoRN.metric2.UniformContinuity CoRN.model.totalorder.QposMinMax CoRN.model.lattice.CRlattice CoRN.model.totalorder.QMinMax Coq.QArith.Qabs CoRN.model.metric2.Qmetric CoRN.metric2.ProductMetric MathClasses.interfaces.canonical_names