A Qualitative Analysis of Some Polynomial Differential Systems of Degree 4
  
Key Words: the asymptotic stablity of the large   PB normal form   Hopf bifurcation   weak focus   limit cycle.  
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Author NameAffiliation
Wang Shuhe Dept. of Math.
USTC 
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Abstract:
      In this paper, we study some polynomial differential systems of degree 4, discuss (i) the asymptotic stability in the large of finite singular points; (ii) the Hopf bifurcations; (iii) the existence and nonexistence of limit cycles.
Citation:
DOI:10.3770/j.issn:1000-341X.1997.04.013
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