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On the Limit Cycles of Quadratic Differential Systems |
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| Authors: | |
| Institution: | (1) Department of Mathematics, Shanghai Jiaotong University, Shanghai 200030, P. R. China E-mail: xzhang@mail.sjtu.edu.cn, CN |
| Abstract: | In this paper we give the necessary and sufficient conditions for all finite critical points of quadratic differential systems to be weak foci, and solve an open problem proposed by Yanquian Ye. Received January 11, 1999, Revised October 10, 2000, Accepted March 5, 2001 |
| Keywords: | Quadratic differential system Limit cycle Ergodicity |
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