fact: Definition uc_assoc (X Y Z : MetricSpace) : ProductMS (ProductMS X Y) Z --> ProductMS X (ProductMS Y Z).
imports: CoRN.model.totalorder.QposMinMax CoRN.metric2.Metric CoRN.metric2.Classification CoRN.metric2.UniformContinuity CoRN.metric2.Prelength CoRN.metric2.Complete CoRN.metric2.LocatedSubset Coq.Unicode.Utf8