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QUALITATIVE STUDY OF A CLASS OF CUBIC SYSTEM
Author(s): 
Pages: 1-10
Year: Issue:  3
Journal: Transactions of Beijing Institute of Technology

Keyword:  limit cyclerotated vector fieldsorbitsingular point.;
Abstract: The systemis studied in the paper.The fact that centers and limit cycles,straight orbits and quadric algebraic closed orbits cannot coexist is proved. The sufficient conditions for the inexistence of limit cycle are given. The existence and unigueness of limit cycle(when b1=b2=b3=b4=0,b62 ?4b5b7 =0) is solved.
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