Makoto Hayashi
There are various types in generalized Liénard systems. In this paper, we treat a Liénard-type system in their paper. Though the existence of homoclinic orbits was discussed in their paper, our aim is to present a tool for the unique existence of limit cycles of the system with one parameter. It is an improvement of the criterion in Hayashi (Adv Dyn Syst Appl 14:179–187, 2019). As applications, the examples in the above paper of Hayashi or Villari and Zanolin (Dyn Syst Appl 25:321–334, 2016) are investigated under the more small parameter for the uniqueness of the limit cycle.
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