Existence of Closed Orbits for Autonomous Planar System
  
Key Words: autonomous planar system   closed orbit   existence.  
Fund Project:
Author NameAffiliation
Yang Qigui Dept. of Math. & Compt. Sci.
Guangxi Normal Univ
Guilin 541004 
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Abstract:
      In this paper, some new sufficient conditions are obtained which ensure that the autonomous planar systemx=P(x,y), y=Q(x,y) has at least one closed orbit. The results improve and extend those in [4-6], and may be used to estimate for roughly the existence place of closed orbit.
Citation:
DOI:10.3770/j.issn:1000-341X.1997.04.014
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