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23 p, 782.4 KB Fixed and moving limit cycles for Liénard equations / Gasull, Armengol (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Sabatini, Marco (Università di Trento. Dipartimento di Matematica)
We consider a family of planar vector fields that writes as a Liénard system in suitable coordinates. It has a fixed closed invariant curve that often contains periodic orbits of the system. We prove a general result that gives the hyperbolicity of these periodic orbits, and we also study the coexistence of them with other periodic orbits. [...]
2019 - 10.1007/s10231-019-00850-z
Annali di Matematica Pura ed Applicata, Vol. 198, Issue 6 (December 2019) , p. 1985-2006  

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