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Identifying weak focus and center in a convection model 期刊论文
APPLIED MATHEMATICS LETTERS, 2020, 卷号: 100, 页码: 7
作者:  Guo, Laigang;  Yu, Pei;  Chen, Yufu
收藏  |  浏览/下载：136/0  |  提交时间：2020/05/24
Convection model  3-dimensional quadratic system  Normal form  Limit cycle  
Bifurcation analysis on a class of three-dimensional quadratic systems with twelve limit cycles 期刊论文
APPLIED MATHEMATICS AND COMPUTATION, 2019, 卷号: 363, 页码: 12
作者:  Guo, Laigang;  Yu, Pei;  Chen, Yufu
收藏  |  浏览/下载：184/0  |  提交时间：2020/01/10
3-dimensional quadratic system  Symmetrical vector field  Normal form  Limit cycle  Isochronous center  
A comparative study of approximate symmetry and approximate homotopy symmetry to a class of perturbed nonlinear wave equations 期刊论文
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS, 2011, 卷号: 74, 期号: 13, 页码: 4300-4318
作者:  Zhang, Zhiyong;  Chen, Yufu
收藏  |  浏览/下载：107/0  |  提交时间：2018/07/30
Approximate symmetry  Optimal system  Reduction  Approximate homotopy symmetry  
Second-order approximate symmetry classification and optimal system of a class of perturbed nonlinear wave equations 期刊论文
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION, 2011, 卷号: 16, 期号: 7, 页码: 2709-2719
作者:  Zhang, Zhiyong;  Gao, Ben;  Chen, Yufu
收藏  |  浏览/下载：98/0  |  提交时间：2018/07/30
Approximate symmetry  Lie reduction  Approximate invariant solution  Optimal system