(* OK: *)
(* THE dx_SUCC OF x BY cF_L1 IS y_1: *)

Lemma cF_L1_x10:forall(m:fmap)(x y:dart),
inv_hmap m -> prec_L m one x y ->
let m1:= L m one x y in
let y0 := cA m zero y in
let y_1 := cA_1 m one y in
let dx := MF.degree m x in
~expf m x y0 ->
Iter (cF m1) dx x = y_1.