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Translated from the original Russian edition of 1987 (Nauka, Moscow), this volume deals with the theory of multifrequency oscillations as a motion of a dynamical system which describes a recurrent trajectory on an invariant toroidal manifold of the system. In this way, the invariant toroidal manifold becomes the main subject of the theory and the existence of such a manifold is a sufficient condition for the existence of multifrequency oscillations of the system. Annotation copyright Book News, Inc. Portland, Or.
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