(* RENAMING of MF.between: *)

Definition betweenf:= MF.between.

Lemma between_expf_L0_1: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 z := Iter (cF m) i x_1 in betweenf m x_1 z y -> expf (L m zero x y) x_1 z.