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Jumping property of Lyapunov values

毛锐;王铎

   A sufficient condition for fcth Lyapunov value to be zero for planar polynomial vector fields is given, which extends the result ofjumping propertyof Lyapunov values obtained by Wang Duo to more general cases. A concrete example that the origin cannot be weak focus of order 1, 2, 4, 5, 8 is presented.……   
[关键词]:I.yapiinov value;weak focus;planar polynomial systems.
[文献类型]:期刊
[文献出处]: 《Science in China1996年12期 Ser.A1996年12期