(* RENAMING of MF.between: *)

Definition betweenf:= MF.between.

Theorem expf_not_expf_L0: forall (m:fmap)(x y:dart), inv_hmap (L m zero x y) -> let x_1:= cA_1 m one x in let x0 := cA m zero x in (expf m x_1 y <-> ~expf (L m zero x y) y x0).