(** Def 5 of (Rose) *)

Definition Mod2_e : Cobham :=
  Rec
    Zero
    (False_e 2)
    (One_e 2)
    (One_e 1).

Lemma DivTwoPower'_correct : forall l, bs2nat (Sem DivTwoPower'_e l) = fun_power (length (hd nil l)) div2 (bs2nat (hd nil (tl l))).