proposition: Theorem CSSM_UB_undec : undecidable CSSM_UB.
proof: Proof. apply (undecidability_from_reducibility SMNdl_UB_undec). exact SMNdl_UB_to_CSSM_UB.reduction. Qed.
imports: Undecidability.Synthetic.Undecidability Undecidability.StackMachines.SSM Undecidability.StackMachines.SMN_undec