proposition: Lemma monotone3_union (gf gf': rel3 T0 T1 T2 -> rel3 T0 T1 T2) (MON1: monotone3 gf) (MON2: monotone3 gf'): monotone3 (gf \4/ gf').
proof: Proof. red; intros. destruct IN. - left. eapply MON1. apply H. apply LE. - right. eapply MON2. apply H. apply LE. Qed.
imports: Program.Basics Paco(paconotation_internal paco_internal pacotac_internal)