On the determination of exact number of limit cycles in Lienard Systems

Details On the determination of exact number of limit cycles in Lienard Systems On the determination of exact number of limit cycles in Lienard Systems

2010-08-13

arxiv.org/abs/1008.2372v1

Mathematics

Classical Analysis and ODEs

Latex 2e, 27 pages, 9 figures

Scientific paper

We present a simpler proof of the existence of an exact number of one or more limit cycles to the Lienard system $\dot{x}=y-F(x) $, $\dot {y}=-g(xt)$, under weaker conditions on the odd functions $F(x) $ and $g(x) $ as compared to those available in literature. We also give improved estimates of amplitudes of the limit cycle of the Van Der Pol equation for various values of the nonlinearity parameter. Moreover, the amplitude is shown to be independent of the asymptotic nature of $F$ as $|x| \to\infty$.

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