| 沈伯骞.二次系统存在抛物线奇异环的充要条件[J].数学研究及应用,1991,11(3):425~431 |
| 二次系统存在抛物线奇异环的充要条件 |
| A Necessary and Sufficient Condition for the Existence of Parabolic Separatrix Cycles in a Quadratic System |
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| DOI：10.3770/j.issn:1000-341X.1991.03.024 |
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| 摘要点击次数: 1989 |
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| 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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