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The motion of a magnetic spin particle in electromagnetic fields isconsidered on the basis of general principles of the classical relativistictheory. Alternative approaches in derivation of the equations of charge motionand spin precession, the problem of noncollinearity of the momentum andvelocity of a particle with spin, the origin and the meaning of Thomasprecession in dynamics of the spin particle are also considered. Thecorrespondence principle in the spin theory is discussed.Comment: 13 pages, LATEX, to be published in Proceedings of "Ninth Lomonosov  Conference on Elementary Particle Physics", World Scientifi

SPIN-ORBITAL MOTION AND THOMAS PRECESSION IN THE CLASSICAL AND QUANTUM THEORIES