proposition: Lemma Qball_0_l (e: Qpos) : Qball (proj1_sig e) 0 (proj1_sig e).
proof: Proof. Proof with auto with qarith. apply ball_sym. apply Qball_0_r. 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