de>  </td> <td>  True if all node content are nonzero numbers </td></tr>
</table>
</p><p>Here is a list of operators that are <b>not</b> implemented, because they make sense only for matrices:</p><p>
<table border="5" cellspacing="5">
<tr><td> <code>a*b</code> </td> <td> Matrix multiplication </td></tr>
<tr><td> <code>a/b</code> </td> <td> Matrix right division </td></tr>
<tr><td> <code>a\b</code> </td> <td> Matrix left division </td></tr>
<tr><td> <code>a^b</code> </td> <td> Matrix power </td></tr>
</table