### Abstract

Recently [H. Giacomini and S. Neukirch, Phys. Rev. E 56, 3809 (1997)], an algorithm to obtain the number of limit cycles of Liénard systems has been proposed. The quoted paper also includes a method to approximate the eventual limit cycles and a conjecture on the behavior of the algorithm. The algorithm is reviewed and some examples, which show that the algorithm is really efficient, are given. However, these examples indicate that the aforementioned conjecture may have been incorrectly stated. A different conjecture is proposed and some open questions are formulated. © 1998 The American Physical Society.

Original language | English |
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Pages (from-to) | 5185-5187 |

Journal | Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics |

Volume | 58 |

Issue number | 4 |

DOIs | |

Publication status | Published - 1 Jan 1998 |

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## Cite this

Llibre, J., Pizarro, L., & Ponce, E. (1998). Limit cycles of polynomial Liénard systems.

*Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics*,*58*(4), 5185-5187. https://doi.org/10.1103/PhysRevE.58.5185