Section Arg1.
Variable T0 : Type.
Variable gf : rel1 T0 -> rel1 T0.
Arguments gf : clear implicits.

Theorem paco_acc: forall
l r (OBG: forall rr (INC: r <1= rr) (CIH: l <1= rr), l <1= paco gf rr),
l <1= paco gf r.