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