Order of cyclicity of the singular point of lineard's polynomial vector fields

  • Carlos Zuppa


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  1. [1]
    N. N. Bautin,On the number of limit cycles arising upon variation of coefficients from a position of equilibrium of the type of a focus or a center, Mat. Sb. N. S. 30 (72) (1952). 181–196.MathSciNetGoogle Scholar
  2. [2]
    A. Lins, W. de Melo and C. C. Pugh,On Lienard's Equation, Springer Lecture Notes 597 (1977), 335–347.Google Scholar
  3. [3]
    A. M. Lyapunov,Stability of Motion, Mathematics in Science And Engineering. vol. 30, Academic Press, New York London, 1966.MATHGoogle Scholar

Copyright information

© Sociedade Brasileira de Matemática 1981

Authors and Affiliations

  • Carlos Zuppa
    • 1
  1. 1.IMPARio de JaneiroBrasil

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