(* RENAMING of MF.between: *)

Definition betweenf:= MF.between.

Lemma expf_L0_CN_1:forall (m:fmap)(x y z:dart)(i:nat), inv_hmap (L m zero x y) -> exd m z -> let x0 := cA m zero x in 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 t:= Iter (cF (L m zero x y)) i z in expf m x_1 y -> (betweenf m x_1 z y /\ betweenf m x_1 t y \/ betweenf m y_0_1 z x0 /\ betweenf m y_0_1 t x0 \/ ~ expf m x_1 z /\ expf m z t).