We calculate it now in the hope that it might be of help to the readers of the accompanying paper on SU(3)xSU(13) where the same formalism is used to discuss some physically interesting problems.
We believe that the geometrical approach presented in these papers will help clarifying the relations and the properties of the fundamental interactions.
It might be used for example to understand the geometrical basis of some recent attempts to compute Cabibbo's angle.]]>