proposition: Lemma gpaco1_step clo r rg: gf (gpaco1 clo rg rg) <1= gpaco1 clo r rg.
proof: Proof. intros. apply gpaco1_step_gen. eapply gf_mon. apply PR. intros. eapply gpaco1_mon. apply PR0. left; apply PR1. left; apply PR1. Qed.
imports: Program.Basics Paco(paco1 pacotac)