In this paper we give the necessary and sufficient conditions for all finite critical points ofquadratic differential systems to be weak foci, and solve an open problem proposed by Yanqian Ye.
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Sun Yat Sen Univ, Sch Math Zhuhai, Zhuhai 519082, Guangdong, Peoples R China
Tsinghua Univ, Dept Math Sci, Beijing 100084, Peoples R ChinaSun Yat Sen Univ, Sch Math Zhuhai, Zhuhai 519082, Guangdong, Peoples R China
Cen, Xiuli
Liu, Changjian
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Sun Yat Sen Univ, Sch Math Zhuhai, Zhuhai 519082, Guangdong, Peoples R ChinaSun Yat Sen Univ, Sch Math Zhuhai, Zhuhai 519082, Guangdong, Peoples R China
Liu, Changjian
Yang, Lijun
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Tsinghua Univ, Dept Math Sci, Beijing 100084, Peoples R ChinaSun Yat Sen Univ, Sch Math Zhuhai, Zhuhai 519082, Guangdong, Peoples R China
Yang, Lijun
Zhang, Meirong
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Tsinghua Univ, Dept Math Sci, Beijing 100084, Peoples R ChinaSun Yat Sen Univ, Sch Math Zhuhai, Zhuhai 519082, Guangdong, Peoples R China