proposition: Lemma Exists_pred_incl : forall P Q l, Exists P l -> pred_incl P Q -> Exists Q l.
proof: Proof. Proof using. introv. induction l; introv H L; inverts* H. Qed.
imports: Coq.Classes.Morphisms TLC(LibTactics LibLogic LibReflect LibOperation LibProd LibOption LibNat LibInt LibWf LibMonoid LibRelation)