fact: Definition ax_HF2 := ∀ ∀ t_f true $1 ≡ t_f false $0 → (t_f true $1 ≡ t_dum ∧ t_f false $0 ≡ t_dum).
imports: Lia Arith Undecidability.PCP.PCP Undecidability.PCP.Util.PCP_facts Undecidability.Synthetic.DecidabilityFacts Undecidability(FOL.Utils.FullSyntax) Undecidability(FOL.FSAT) Undecidability.Shared.ListAutomation