fact: Definition not_forall_exists_not_DN (T: Type) (P: T -> Prop) (Pd: forall x, P x \/ ~ P x): (~ forall x, P x) -> DN (exists x, ~ P x).
imports: CoRN.algebra.RSetoid CoRN.metric2.Metric CoRN.metric2.UniformContinuity CoRN.model.totalorder.QposMinMax Coq.Classes.Morphisms CoRN.reals.fast.CRGroupOps CoRN.logic.Classic