The Center Problem and Time-Reversibility with Respect to a Quadratic Involution for a Class of Polynomial Differential Systems with Order 2 or 3  

作　　者：YANG Jing YANG Ming LU Zhengyi 

机构地区：[1]Chengdu Institute of Computer Application,Chinese Academy of Sciences,Chengdu,610041,China [2]University of Chinese Academy of Sciences,Beijing,100049,China [3]School of Mathematical Sciences,Sichuan Normal University,Chengdu,610068,China

出　　处：《Journal of Systems Science & Complexity》2022年第4期1608-1636,共29页系统科学与复杂性学报（英文版）

基　　金：partially supported by the Specialized Research Fund for the Doctoral Program of Higher Education(SRFDP,China)under Grant No.20115134110001。

摘　　要：Most studies of the time-reversibility are limited to a linear or an affine involution.In this paper,the authors consider the case of a quadratic involution.For a polynomial differential system with a linear part in the standard form(-y,x)in R~2,by using the method of regular chains in a computer algebraic system,the computational procedure for finding the necessary and sufficient conditions of the system to be time-reversible with respect to a quadratic involution is given.When the system is quadratic,the necessary and sufficient conditions can be completely obtained by this procedure.For some cubic systems,the necessary and sufficient conditions for these systems to be time-reversible with respect to a quadratic involution are also obtained.These conditions can guarantee the corresponding systems to have a center.Meanwhile,a property of a center-focus system is discovered that if the system is time-reversible with respect to a quadratic involution,then its phase diagram is symmetric about a parabola.

关 键 词：Center polynomial differential systems quadratic involution regular chains time-reversibility 

分 类 号：O174.14[理学—数学]