proposition: Lemma normal_form_enc_halt_cbn_lam : normal_form enc_halt_cbn_lam.
proof: Proof. by do ? constructor. Qed.
imports: Undecidability.LambdaCalculus(Krivine Lambda Util.Krivine_facts) Undecidability.LambdaCalculus.Util.term_facts Undecidability.Shared.deterministic_simulation Relations List ssreflect