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Nine Limit Cycles in a 5-Degree Polynomials Liénard System

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  • Junning Cai
  • Minzhi Wei
  • Hongying Zhu

Abstract

In this article, we study the limit cycles in a generalized 5-degree Liénard system. The undamped system has a polycycle composed of a homoclinic loop and a heteroclinic loop. It is proved that the system can have 9 limit cycles near the boundaries of the period annulus of the undamped system. The main methods are based on homoclinic bifurcation and heteroclinic bifurcation by asymptotic expansions of Melnikov function near the singular loops. The result gives a relative larger lower bound on the number of limit cycles by Poincaré bifurcation for the generalized Liénard systems of degree five.

Suggested Citation

  • Junning Cai & Minzhi Wei & Hongying Zhu, 2020. "Nine Limit Cycles in a 5-Degree Polynomials Liénard System," Complexity, Hindawi, vol. 2020, pages 1-10, November.
    • Handle: RePEc:hin:complx:8584616
    DOI: 10.1155/2020/8584616
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