| (pos n) \Rightarrow (neg (pred ((S m) * (S n))))
| (neg n) \Rightarrow (pos (pred ((S m) * (S n))))]].
-(*CSC: the URI must disappear: there is a bug now *)
-interpretation "integer times" 'times x y = (cic:/matita/library_autobatch/Z/times/Ztimes.con x y).
+interpretation "integer times" 'times x y = (Ztimes x y).
theorem Ztimes_z_OZ: \forall z:Z. z*OZ = OZ.
intro.