proposition: Lemma monotone0_union (gf gf': rel0 -> rel0) (MON1: monotone0 gf) (MON2: monotone0 gf'): monotone0 (gf \1/ 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)