Section Arg9.
Variable gf : rel9 T0 T1 T2 T3 T4 T5 T6 T7 T8 -> rel9 T0 T1 T2 T3 T4 T5 T6 T7 T8.
Arguments gf : clear implicits.

Theorem _paco9_fold: forall r,
gf (upaco9 gf r) <9== paco9 gf r.