proposition: Lemma monotone4_union (gf gf': rel4 T0 T1 T2 T3 -> rel4 T0 T1 T2 T3) (MON1: monotone4 gf) (MON2: monotone4 gf'): monotone4 (gf \5/ 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)