(* RENAMING of MF.between: *)

Definition betweenf:= MF.between.

Lemma expf_L0_5bis:forall (m:fmap)(x y z t:dart), inv_hmap (L m zero x y) -> exd m z -> let x_1 := cA_1 m one x in ~ expf m x_1 y -> (expf m x_1 z /\ expf m x_1 t \/ expf m y z /\ expf m y t) -> expf (L m zero x y) z t.