proposition: Lemma existSimp (T : System) (f : Formula) (v : nat): SysPrf T f -> SysPrf T (exH v, f)%fol.
proof: Proof. apply (existSimp LNN). Qed.
imports: Coq(Arith Ensembles List) LibHyps(LibHyps) hydras(MoreLibHyps NewNotations)