These notes represent an attempt to give a unified presentation of various aspects of the physics of particles and fields (including gravitation) using the space of inertial local frames instead of the specetime manifold. The notes are not yet complete. In the meantime any criticism, suggestion or indication of forgotten references will be wellcome. Plase send them to the e-mail address toller@iol.it. With an explicit authorization, the e-mail or a part of it will be posted on this site (a very simple form of "blog").
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