proposition: Lemma in_centered_Qball (w: Q) (m x: Q): m <= x <= m + w -> Qball ((1#2) * w) (m + (1#2) * w) x.
proof: Proof. intros [??]. apply in_Qball. split; simpl; ring_simplify; assumption. Qed.
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