proposition: Lemma hpos : 0 < h.
proof: Proof. apply Qlt_minus_iff in Hbt. exact Hbt. 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