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    • 杨翠红,梁肇军,张兴安.R3中一类二次系统的5个极限环[J].数学年刊A辑,2010,31(4):497~506
    R3中一类二次系统的5个极限环
    Five Limit Cycles for a Class of Quadratic Systems in R3
      
    DOI：
    中文关键词:  极限环  不变锥  切向量场
    英文关键词:
    基金项目:国家自然科学基金(No.10701037;No.10771081)资助的项目
    Author NameAffiliationE-mail
    YANG Cuihong School of Mathematics and Statistics, Huazhong Normal University, Wuhan 430079, China. yangcuihong100@yahoo.com.cn 
    LIANG Zhaojun School of Mathematics and Statistics, Huazhong Normal University, Wuhan 430079, China. zjliang@mail.ccnu.edu.cn 
    ZHANG Xinan School of Mathematics and Statistics, Huazhong Nor- mal University, Wuhan 430079, China. zhangxinan@hotmail.com 
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    中文摘要:
          建立了联系R3中一类二次系统与二维流形球面S2的切向量场之间的桥梁,证明了R3中一类二次系统存在5个极限环,而且这5个极限环分别位于该系统的5个不变闭锥上.
    英文摘要:
          
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