proposition: Theorem EILL_undec : undecidable EILL_PROVABILITY.
proof: Proof. undec from PCP_undec using chain PCP_chain_ILL. Qed.
imports: Undecidability.Shared.Libs.DLW(utils_tac) Undecidability.Synthetic.Undecidability Undecidability.Synthetic.ReducibilityFacts Undecidability.PCP(PCP PCP_undec) Undecidability.StackMachines(BSM) Undecidability.MinskyMachines(MM MM_sss) Undecidability.ILL(EILL ILL iBPCP_MM MM_EILL EILL_ILL) Undecidability.PCP.Reductions.HaltTM_1_to_PCPb