proposition: Lemma forallE (T : System) (f : Formula) (v : nat) (t : Term) : SysPrf T (allH v, f)%nt -> SysPrf T (substF f v t).
proof: Proof. apply (forallE LNT). Qed.
imports: Coq(Arith Ensembles List) hydras.Ackermann(Languages folProof folProp folLogic3)