Section ListDenoteLems.
Context {A T : Type}.
Variables (f : A -> T) (g : T -> T -> T) (b : T).
Proof with auto.
induction l; simpl... rewrite IHl, listd_app; apply H.
Qed.
Proof with auto. induction l; simpl... rewrite IHl, fgAS... Qed.

Lemma listd_perm l l' (Hperm : Permutation l l') :
listd f g b l = listd f g b l'.