Abstract
In this paper, bifurcations of limit cycles at three fine focuses for a class of Z 2-equivariant non-analytic cubic planar differential systems are studied. By a transformation, we first transform nonanalytic systems into analytic systems. Then sufficient and necessary conditions for critical points of the systems being centers are obtained. The fact that there exist 12 small amplitude limit cycles created from the critical points is also proved. Henceforth we give a lower bound of cyclicity of Z 2-equivariant non-analytic cubic differential systems.
Similar content being viewed by others
References
Li, J.: Hilberts 16th problem and bifurcation of Planar polynomial vector fields. Int. J. Bifurcation Chaos, 13, 47–106 (2003)
Yu, P., Han, M. A.: Small limit cycles bifurcation from fine focus points in cubic order Z 2-equivariant vector fields. Chaos, Solitons and Fractals, 24, 329–348 (2005)
Lloyd, N. G., Pearson J. M.: Reduce and the bifurcation of limit cycles. J. Symbolic Comput., 9, 215–224 (1990)
Liu, Y., Li, J.: Theory of values of singular point in complex autonomous differential system. Sci. China Ser. A, 3, 245–255 (1989)
Liu, Y.: Theory of center-focus for a class of higher-degree critical points and infinite points. Sci. China Ser. A, 44, 37–48 (2001)
Shi, S. L.: A concrete example of the existence of four limit cycles for quadratic systems. Sci. China Ser. A, 23, 16–21 (1980)
Chen, L. S., Wang, M. S.: The relative position and number of limit cycles of a quadratic differential system. Acta Mathematica Sinica, Chinese Series, 22(6), 751–758 (1979)
Liu, Y., Huang, W. T.: A cubic system with twelve small amplitude limit cycles. Bull. Sci. Math., 129, 83–98 (2005)
Wang, Q. L., Liu, Y. R., Du, C. X.: Small limit cycles bifurcating from fine focus points in quartic order Z 3-equivariant vector fields. J. Math. Anal. Appl., 337, 524–536 (2008)
Wu, Y. H., Gao, Y. X., Han, M. A.: Bifurcations of the limit cycles in a Z 3-equivariant quartic planar vector field. Chaos, Solitons and Fractals, 38, 1177–1186 (2008)
Yu, P., Han, M., Yuan, Y.: Analysis on limit cycles of Z q-equivariant polynomial vector fields with degree 3 or 4. J. Math. Anal. Appl., 322, 51–65 (2006)
Du, C., Mi, H., Liu, Y.: Center, limit cycles and isochronous center of a Z 4-equivariant quintic system. Acta Mathematica Sinica, English Series, 26(6), 1183–1191 (2010)
Llibre, J., Valls, C.: Classification of the centers, their cyclicity and isochronicity for a class of polynomial differential systems generalizing the linear systems with cubic homogeneous nonlinearities. J. Differential Equations, 246, 2192–2204 (2009)
Llibre, J., Valls, C.: Classification of the centers and isochronous centers for a class of quartic-like systems. Nonlinear Analysis, 71, 3119–3128 (2009)
Llibre, J., Valls, C.: Classification of the centers, their cyclicity and isochronicity for the generalized quadratic polynomial differential systems. J. Math. Anal. Appl., 357, 427–437 (2009)
Llibre, J., Valls, C.: Classification of the centers, of their cyclicity and isochronicity for two classes of generalized quintic polynomial differential systems. Nonlinear Differ. Equ. Appl., 16, 657–679 (2009)
Li, J.: The generalized focal values and bifurcations of limit cycles for quasi-quadratic system. Acta Mathematica Sinca, Chinese Series, 45, 671–682 (2002)
Liu, Y., Li, J., Huang, W.: Singular point vaules, center problem and bifurcations of limit cycles of two dimensional differential autonomous systems. Science Press, China, 2009, 162–190
Liu, Y.: The Generalized focal values and bifurcation of limits cycles for quasi quadratic systems. Acta Mathematica Sinica, Chinese Series, 45, 671–682 (2002)
Xiao, P.: Critical point quantities and integrability conditions for complex planar resonant polynomial differential systems, PhD thesis, Central South University, 2005
Liu, Y., Li, J.: Some Classical Problems about Planar Vector Fileds (in Chinese), Science Press (China), Beijing, 2010
Liu, Y., Chen, H.: Formulas of singular point quantities and the first 10 saddle quantities for a class of cubic system. Acta Math. Appl. Sinica, 25, 295–302 (2002)
Amelbkin, B. B., Lukasevnky, H. A., Catovcki, A. N.: Nonlinear Vibration, VGU Lenin Publ., Moscow, 1982, 19–21
Han, M. A., Lin, Y. P.: A study on the existence of limit cycles of a planar system with 3rd-degree polynomials. Int. J. Bifurcation Chaos, 14, 41–60 (2004)
Author information
Authors and Affiliations
Corresponding author
Additional information
Supported by National Nature Science Foundation of China (Grant Nos. 11071222, 11101126)
Electronic supplementary material
Rights and permissions
About this article
Cite this article
Li, F., Liu, Y.R. & Jin, Y.L. Bifurcations of limit circles and center conditions for a class of non-analytic cubic Z 2 polynomial differential systems. Acta. Math. Sin.-English Ser. 28, 2275–2288 (2012). https://doi.org/10.1007/s10114-012-0454-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10114-012-0454-z