proposition: Lemma lrle : l <= r.
proof: Proof. rewrite <- (Qplus_0_r l). unfold r. apply Qplus_le_r, Qpos_nonneg. Qed.
imports: QArith.Qround CoRN.metric2.Metric CoRN.metric2.ProductMetric CoRN.metric2.UniformContinuity CoRN.reals.fast.RasterizeQ CoRN.reals.fast.Interval CoRN.metric2.Graph CoRN.model.totalorder.QMinMax CoRN.model.totalorder.QposMinMax