Multidimensional Analogues of the van der Pol Equation
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As we have already noted in §1.1, by a multidimensional analogue of the van der Pol equation we mean a dynamical system with a minimal global attractor, containing a cycle and a unique Lyapunov unstable state of equilibrium. Various concrete three — dimensional systems possessing this property have been studied in the classical works of K.O.Friedrichs , L.L.Rauch , B.V.Shirokorad  and others.
KeywordsPeriodic Solution Frequency Criterion Negative Real Part Invariant Torus Positive Real Part
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