Section Arg5.
Variable gf : rel5 T0 T1 T2 T3 T4 -> rel5 T0 T1 T2 T3 T4.
Arguments gf : clear implicits.

Theorem paco5_unfold: forall (MON: monotone5 gf) r,
paco5 gf r <5= gf (upaco5 gf r).