Electron. J. Differential Equations, Vol. 2019 (2019), No. 107, pp. 1-23.

Limit cycles in piecewise smooth perturbations of a quartic isochronous center

Haifeng Song, Linping Peng, Yong Cui

Abstract:
This article concerns the bifurcation of limit cycles from a quartic integrable and non-Hamiltonian system. By using the first order averaging method and some mathematical technique on estimating the number of the zeros, we show that under a class of piecewise smooth quartic perturbations, seven is a lower and twelve an upper bound for the maximum number of limit cycles bifurcating from the unperturbed quartic isochronous center.

Submitted April 9, 2019. Published September 18, 2019.
Math Subject Classifications: 37G15, 37D45, 34C07.
Key Words: Averaging method; piecewise smooth perturbation; limit cycle; quartic isochronous center, ECT-system.

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Haifeng Song
School of Mathematics and System Sciences
Beihang University
LIMB of the Ministry of Education
Beijing 100191, China
email: haiwindsong@163.com
Linping Peng
School of Mathematics and System Sciences
Beihang University
LIMB of the Ministry of Education
Beijing 100191, China
email: penglp@buaa.edu.cn
Yong Cui
School of Automation Science and Electrical Engineering
Beihang University
Beijing 100191, China
email: cuiyongsas@163.com

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