9 citations · 9 across the 2 of their papers we have counts for
2 papers
math.CA2023
The number of limit cycles of Josephson equation
Xiangqin Yu, Hebai Chen, Changjian Liu
In this paper, the existence and number of non-contractible limit cycles of the Josephson equation are studied, where $ϕ\…
math.DS2023★ 9 cited
Centers and invariant straight lines of planar real polynomial vector fields and its configurations
Hongjin He, Changjian Liu, Dongmei Xiao
In the paper, we first give the least upper bound formula on the number of centers of planar real polynomial Hamiltonian vector fields. This formula reveals that the greater the nu…