proposition: Lemma locatedQ : locatedMetric Q_as_MetricSpace.
proof: Proof. apply decidable_located. auto with *. Defined.
imports: CoRN.metric2.Metric CoRN.metric2.Prelength CoRN.metric2.Classification CoRN.model.totalorder.QMinMax CoRN.model.totalorder.QposMinMax Coq.QArith.Qabs CoRN.metric2.UniformContinuity MathClasses.implementations.stdlib_rationals