> <td> Matrix power </td></tr>
% </table>
% </html>
%
% There are others, such as trigonometric operators, that are not
% implemented yet, because I did not find a use for them in my work. Should
% you need them, press me.







%% Calling generic function on nodes content
%
% Another solution, if you do not find happiness with the above operators,
% is to call a generic function on the nodes content. There is two methods
% to do that. 
%
% *|treefun|* apply a 1-argument function on the content of each nod