proposition: Lemma DN_decisionT (P: Type): DN (P + (P->False)).
proof: Proof. firstorder. Qed.
imports: CoRN.algebra.RSetoid CoRN.metric2.Metric CoRN.metric2.UniformContinuity CoRN.model.totalorder.QposMinMax Coq.Classes.Morphisms CoRN.reals.fast.CRGroupOps CoRN.logic.Classic