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(* GNU General Public License for more details.                       *)
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(* 02110-1301 USA                                                     *)
Require Export Q_field.

Theorem Qmult_sym : forall n m : Q, Qmult n m = Qmult m n.
intros n m; case m; case n; auto; intros n' m'; simpl in |- *;
rewrite Qpositive_mult_sym; auto.