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Z 2-equivariant cubic system which yields 13 limit cycles

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Abstract

For the planar Z 2-equivariant cubic systems having two elementary focuses, the characterization of a bi-center problem and shortened expressions of the first six Lyapunov constants are completely solved. The necessary and sufficient conditions for the existence of the bi-center are obtained. On the basis of this work, in this paper, we show that under small Z 2-equivariant cubic perturbations, this cubic system has at least 13 limit cycles with the scheme 1 ⊂ 6 ∪ 6.

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Correspondence to Yi-rong Liu.

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Supported by the National Natural Science Foundation of China (No. 11371373 and 10831003).

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Liu, Yr., Li, Jb. Z 2-equivariant cubic system which yields 13 limit cycles. Acta Math. Appl. Sin. Engl. Ser. 30, 781–800 (2014). https://doi.org/10.1007/s10255-014-0420-x

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  • DOI: https://doi.org/10.1007/s10255-014-0420-x

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