proposition: Fact ra_cst_inj n m : ra_cst n = ra_cst m -> n = m.
proof: Proof. inj. Qed.
imports: Arith Lia List Bool Eqdep_dec Undecidability.Shared.Libs.DLW(utils_tac utils_nat utils_list finite pos vec) Undecidability.MuRec.MuRec