Section Arg8.
Variable gf : rel8 T0 T1 T2 T3 T4 T5 T6 T7 -> rel8 T0 T1 T2 T3 T4 T5 T6 T7.
Arguments gf : clear implicits.

Theorem _paco8_fold: forall r,
gf (upaco8 gf r) <8== paco8 gf r.