Proof with norm.
intros; rewrite sepcon_comm. apply sepcon_emp.
Qed.

(* Specifications: *)
Lemma emp_wand {A}{NA: NatDed A}{SA: SepLog A}{CA: ClassicalSep A}:
forall P: A, emp -* P = P.
Lemma TT_andp {A}{NA: NatDed A}: forall P: A,  TT && P = P.
Proof with norm.