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On the approximation of the limit cycles function

By Leonid Cherkas and Klaus R. Schneider


We consider planar vector fields depending on a real parameter. It is assumed that this vector field has a family of limit cycles which can be described by means of the limit cycles function l. We prove a relationship between the multiplicity of a limit cycle of this family and the order of a zero of the limit cycles function. Moreover, we present a procedure to approximate l(x), which is based on the Newton scheme applied to the Poincaré function and represents a continuation method. Finally, we demonstrate the effectiveness of the proposed procedure by means of a Liénard system. Key words: family of limit cycles, multiple limit cycle, Liénard syste

Year: 2014
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