proposition: Lemma impI (T : System) (f g : Formula): SysPrf (Ensembles.Add _ T g) f -> SysPrf T (g -> f)%fol.
proof: Proof. apply (impI LNN). Qed.
imports: Coq(Arith Ensembles List) LibHyps(LibHyps) hydras(MoreLibHyps NewNotations)