proposition: Lemma monotone0_compose (gf gf': rel0 -> rel0) (MON1: monotone0 gf) (MON2: monotone0 gf'): monotone0 (compose gf gf').
proof: Proof. red; intros. eapply MON1. apply IN. intros. eapply MON2. apply PR. apply LE. Qed.
imports: Program.Basics Paco(paconotation_internal paco_internal pacotac_internal)