On the number of limit cycles of the Lienard equation
Abstract
In this paper, we study a Lienard system of the form dotx=y-F(x), doty=-x, where F(x) is an odd polynomial. We introduce a method that gives a sequence of algebraic approximations to the equation of each limit cycle of the system. This sequence seems to converge to the exact equation of each limit cycle. We obtain also a sequence of polynomials Rn(x) whose roots of odd multiplicity are related to the number and location of the limit cycles of the system.
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