| 一类具有二阶细焦点的二次系统 |
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| 引用本文： | 王学进.一类具有二阶细焦点的二次系统[J].数学学报,1998,41(2):399-040. |
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| 作者姓名： | 王学进 |
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| 作者单位： | NO.22 Postbox 5122 Beijing，Beijing 100094，China |
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| 摘 要： | 本文证明了一类具有二阶细焦点的二次系统（在其二阶细焦点外围）至多存在一个极限环．
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| 关 键 词： | 二次系统，极限环，二阶细焦点 |
| 收稿时间： | 1996-9-17 |
| 修稿时间： | 1997-4-17 |
A Kind of Quadratic Differe |
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| Wang Xuejin.A Kind of Quadratic Differe[J].Acta Mathematica Sinica,1998,41(2):399-040. |
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| Authors: | Wang Xuejin |
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| Institution: | NO.22 Postbox 5122 Beijing, Be |
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| Abstract: | This paper is intended to prove that there exists at most one limit cycle around the fine focus of order 2 of a kind of quadratic differentiable system. |
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| Keywords: | Limit cycle Fine focus of order 2 Quadratic differential system |
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