Section Arg13.
Variable gf : rel13 T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 -> rel13 T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12.
Arguments gf : clear implicits.

Theorem paco13_acc: forall
l r (OBG: forall rr (INC: r <13= rr) (CIH: l <13= rr), l <13= paco13 gf rr),
l <13= paco13 gf r.