Section Arg1_1.
Definition monotone1 T0 (gf: rel1 T0 -> rel1 T0) :=
forall x0 r r' (IN: gf r x0) (LE: r <1= r'), gf r' x0.
Variable T0 : Type.
Variable gf: rel1 T0 -> rel1 T0.
Arguments gf: clear implicits.
(*Implicit Arguments gf [  ].*)

Theorem paco1_2_1_acc: forall
l r_0 r_1 (OBG: forall rr (INC: r_1 <1= rr) (CIH: l <_paco_1= rr), l <_paco_1= paco1_2_1 gf_0 gf_1 r_0 rr),
l <1= paco1_2_1 gf_0 gf_1 r_0 r_1.