To Arkady Vainshtein on his 60th anniversary

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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.]]>

This paper will appear in part two of Symmetry in Nature, a volume in honour of Luigi Radicati di Brozolo, Sculoa Normale Superiore, Pisa, 1989]]>