A cubic system with thirteen limit cycles

作者:Li Chengzhi; Liu Changjian; Yang Jiazhong*
来源:Journal of Differential Equations, 2009, 246(9): 3609-3619.
DOI:10.1016/j.jde.2009.01.038

摘要

We construct a planar cubic system and demonstrate that it has at least 13 limit cycles. The construction is essentially based on Counting the number of zeros of some Abelian integrals.