| ON THE DECISION PROBLEM OF THE CENTER OR FOCUS FOR A CLASS OF PLANAR POLYNOMIAL FIELDS |
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| 作者姓名： | 谢向东 蔡燧林 |
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| 作者单位： | 宁德师专(谢向东)，浙江大学(蔡燧林) |
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| 摘 要： | １Ｔｈｅｄｅｃｉｓｉｏｎｐｒｏｂｌｅｍｏｆｔｈｅｃｅｎｔｅｒｏｒｆｏｃｕｓｉｓｉｍｐｏｒｔａｎｔｉｎｓｔｕｄｙｉｎｇｑｕａｌｉｔａｔｉｖｅｔｈｅｏｒｙｏｆｄｉｆｅｒｅｎｔｉａｌｅｑｕａｔｉｏｎ．Ｔｈｅｒｅａｒｅｍａｎｙｍｅｔｈｏｄｓｔｏｓｏｌｖｅｔｈ...
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| 关 键 词： | decision problem of the center or focus Abel equation Poincaré return map. |
ON THE DECISION PROBLEM OF THE CENTER OR FOCUS FOR A CLASS OF PLANAR POLYNOMIAL FIELDS * |
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| Xie Xiangdong.ON THE DECISION PROBLEM OF THE CENTER OR FOCUS FOR A CLASS OF PLANAR POLYNOMIAL FIELDS[J].微分方程年刊(英文版),1998(1). |
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| Authors: | Xie Xiangdong |
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| Institution: | Xie Xiangdong (Ningde Teacher's College:352100) (Cai Suilin (Zhejiang University:310027) |
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