| 二次系统存在抛物线奇异环的充要条件 |
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| 引用本文： | 沈伯骞.二次系统存在抛物线奇异环的充要条件[J].数学研究与评论,1991,11(3):425-431. |
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| 作者姓名： | 沈伯骞 |
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| 作者单位： | 辽宁师范大学数学系 |
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| 摘 要： | In this paper . we obtained a necessary and sufficient condition for the existence of parabolic separatrix cycles in a quadratic system, and drawed its all possible phase-portraits. Further we obtain an accurate parameter interval that a Ⅲ type system exist ltmit cycles.
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| 关 键 词： | 二次系统 抛物线 奇异环 奇点 |
A Necessary and Sufficient Condition for the Existence of Parabolic Separatrix Cycles in a Quadratic System |
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| Shen Boqian.A Necessary and Sufficient Condition for the Existence of Parabolic Separatrix Cycles in a Quadratic System[J].Journal of Mathematical Research and Exposition,1991,11(3):425-431. |
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| Authors: | Shen Boqian |
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| Institution: | Liaoning Normal University; Dalian |
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| Abstract: | |
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