proposition: Lemma contains_nil T : List.nil ⊏ T.
proof: Proof. auto with contains_theory. Qed.
imports: Undecidability.FOL.Syntax(Core Facts) Undecidability.Synthetic(Definitions DecidabilityFacts EnumerabilityFacts ListEnumerabilityFacts ReducibilityFacts) Undecidability(Shared.ListAutomation) Undecidability(Shared.Libs.PSL.Vectors.Vectors) Coq.Setoids.Setoid Arith Lia List