fact: Definition fun_rel' phi := ∀ ∀ ∀ phi[$2 .: $1 .: Nat.add 3 >> var] ~> phi[$2 .: $0 .: Nat.add 3 >> var] ~> $1 ≡' $0.
imports: Undecidability.FOL.Util.Syntax Undecidability.FOL.Util.FullTarski Undecidability.FOL.Util.FullDeduction Undecidability.FOL.ZF List