proposition: Lemma in_hd X n (v : Vector.t X (S n)) : Vector.In (Vector.hd v) v.
proof: Proof. apply (Vector.caseS' v). intros. constructor. Qed.
imports: Undecidability.FOL(Semantics.FiniteTarski.Full) Undecidability.FOL(Syntax.Facts Semantics.Tarski.FullFacts Syntax.BinSig) Undecidability.SeparationLogic(MSL) Undecidability.Shared(Dec) Undecidability.Synthetic.DecidabilityFacts List