Section Main.
Variable gf: rel -> rel.
Hypothesis gf_mon: monotone13 gf.
Variant gpaco13 clo r rg x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 : Prop :=
| gpaco13_intro (IN: @rclo13 clo (paco13 (compose gf (rclo13 clo)) (rg \13/ r) \13/ r) x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12)
.
Definition gupaco13 clo r := gpaco13 clo r r.
Hint Resolve gpaco13_def_mon : paco.

Lemma gpaco13_unfold clo r rg:
gpaco13 clo r rg <13= rclo13 clo (gf (gupaco13 clo (rg \13/ r)) \13/ r).