proposition: Fact ra_zero_tot : total [| ra_zero |].
proof: Proof. intros ?; exists 0; simpl; red; auto. Qed.
imports: Arith Lia List Bool Eqdep_dec Undecidability.Shared.Libs.DLW(utils_tac utils_nat utils_list finite pos vec) Undecidability.MuRec.MuRec