fact: Definition L_decidable {X} `{encodable X} (P : X -> Prop) := exists f : X -> bool, is_computable f /\ forall x, P x <-> f x = true.
imports: Undecidability.L(Computability.MuRec) Undecidability.L.Datatypes(LNat LOptions LProd) Undecidability.Synthetic(DecidabilityFacts EnumerabilityFacts ListEnumerabilityFacts ReducibilityFacts) Undecidability.L.Datatypes.List(List_basics List_nat) Datatypes