(* RENAMING of MF.between: *)

Definition betweenf:= MF.between.

Lemma between_expf_L0_4_prel:forall(m:fmap)(x y:dart)(i:nat), inv_hmap (L m zero x y) -> let x_1 := cA_1 m one x in let y_0 := cA_1 m zero y in let y_0_1 := cA_1 m one y_0 in let z := Iter (cF m) i y_0_1 in ~ expf m x_1 y -> betweenf m y_0_1 z y -> expf (L m zero x y) y_0_1 z.