proposition: Corollary undecidable_model_deduction_Z : Aczel_CE.CE -> undecidable deduction_Z.
proof: Proof. intros H. now apply undecidable_deduction_Z, extensionality_model. Qed.
imports: Undecidability.Synthetic.Definitions Undecidability.Synthetic.Undecidability Undecidability.FOL(Semantics.Tarski.FullFacts Semantics.Tarski.FullSoundness) Undecidability.FOL.Sets.Models(Aczel_CE Aczel_TD ZF_model HF_model) Undecidability.FOL.Reductions(ZF_to_HF PCPb_to_HF PCPb_to_HFD PCPb_to_ZFeq PCPb_to_ZF PCPb_to_ZFD) Undecidability.FOL.Sets.ZF Undecidability.FOL.ZF Undecidability.PCP(PCP PCP_undec Util.PCP_facts Reductions.PCPb_iff_dPCPb)