NOTES ON RELATIVISTIC-EQUATIONS OF SPIN MOTION

Grounds and applications of Bargmann-Michel-Telegdi equations for the precession of the polarization vector of relativistic particles are co nsidered. A critical question in the discussion is the orientation of the rest frame reference vectors. Moller reference frames which keep c onstant the mutual orientation of the two infinitely close in time res t frames are shown to have a special role. The generally covariant for m of the equations is discussed. The assertion that the principle of r elativity is violated in the phenomenon of spin precession is proved t o be untrue.