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