proposition: Fact ra_min_inj k f f' : @ra_min k f = ra_min f' -> f = f'.
proof: Proof. inj; intros; diauto. Qed.
imports: Arith Lia List Bool Eqdep_dec Undecidability.Shared.Libs.DLW(utils_tac utils_nat utils_list finite pos vec) Undecidability.MuRec.MuRec