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《Journal of Beijing Jiaotong University》 2006-06
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On the Center of the Liénard Equation

ZUO Chun-yan,WANG Xiao-xia (School of Science,Beijing Jiaotong University,Beijing 100044,China)  
In this paper,some criteria which judge the origin of the Liénard system to be a local center or a global center are given.The conditions of a center for the Liénard system are generalized and improved.
【Fund】: 北京自然科学基金资助项目(4052022)
【CateGory Index】: O175
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