proposition: Lemma numeral_lt k l : k < l -> numeral k ∈ numeral l.
proof: Proof. Proof using M_ZF VIEQ. induction 1; cbn; apply sigma_el; auto. Qed.
imports: Undecidability.FOL(Syntax.Facts Semantics.Tarski.FullFacts) Undecidability.FOL(Sets.ZF) Undecidability.FOL(ZF) Undecidability.FOL.TRAKHTENBROT(hfs) Undecidability.Shared.Libs.DLW.Utils(finite) Undecidability(Shared.ListAutomation) Lia