(* RENAMING of MF.between: *)

Definition betweenf:= MF.between.

Lemma expf_expf_L0_1:forall (m:fmap)(x y z:dart)(i:nat), inv_hmap (L m zero x y) -> exd m z -> let x_1 := cA_1 m one x in let t := Iter (cF m) i z in expf m x_1 y -> ~ expf m x_1 z -> expf (L m zero x y) z t.