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math.CA2019
On the transformations linearizing isochronous centers of Hamiltonian systems
Guangfeng Dong, Yuyi Zhang
In this paper we study the transformations linearizing isochronous centers of planar Hamiltonian differential systems with polynomial Hamiltonian functions having only iso…
math.CA2017★ 1 cited
On the maximal saddle order of p:-q resonant saddle
Guangfeng Dong, Changjian Liu, Jiazhong Yang
In this paper, we obtain some estimations of the saddle order which is the sole topological invariant of the non-integrable resonant saddles of planar polynomial vector fields of a…