proposition: Lemma rel_incl_rclosure_rclosure : forall R1 R2, rel_incl R1 (rclosure R2) -> rel_incl (rclosure R1) (rclosure R2).
proof: Proof. Proof using. introv H M. destruct* M. Qed.
imports: TLC(LibTactics LibLogic LibBool LibLogic LibProd LibSum)