Planar quasi-homogeneous polynomial systems with a given weight degree

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July 2016, 36(7): 4015-4025. doi: 10.3934/dcds.2016.36.4015

Planar quasi-homogeneous polynomial systems with a given weight degree

Yanqin Xiong ^1, and Maoan Han ^2,

1.	School of Mathematics and Statistics, Nanjing University of Information Science & Technology, Nanjing 210044, China
2.	Department of Mathematics, Shanghai Normal University, Shanghai 200234

Received January 2015 Revised January 2016 Published March 2016

Abstract
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In this paper, we investigate a class of quasi-homogeneous polynomial systems with a given weight degree. Firstly, by some analytical skills, several properties about this kind of systems are derived and an algorithm can be established to obtain all possible explicit systems for a given weight degree. Then, we focus on center problems for such systems and provide some necessary conditions for the existence of centers. Finally, for a specific quasi-homogeneous polynomial system, we characterize its center and prove that the center is not isochronous.

Keywords: Quasi-homogeneous polynomial system, weight degree, isochronous center..

Mathematics Subject Classification: Primary: 34C05, 34C07, 34C2.

Citation: Yanqin Xiong, Maoan Han. Planar quasi-homogeneous polynomial systems with a given weight degree. Discrete and Continuous Dynamical Systems, 2016, 36 (7) : 4015-4025. doi: 10.3934/dcds.2016.36.4015

References:

[1]	W. Aziz, J. Llibre and C. Pantazi, Centers of quasi-homogeneous polynomial differential equations of degree three, Advances in Mathematics, 254 (2014), 233-250. doi: 10.1016/j.aim.2013.12.006.
[2]	A. Cima and J. Llibre, Algebraic and topological classification of the homogeneous cubic systems in the plane, J. Math. Anal. Appl., 147 (1990), 420-448. doi: 10.1016/0022-247X(90)90359-N.
[3]	T. Date and M. Lai, Canonical forms of real homogeneous quadratic transformations, J. Math. Anal. Appl., 56 (1976), 650-682. doi: 10.1016/0022-247X(76)90031-7.
[4]	T. Date, Classification and analysis of two-dimensional homogeneous quadratic differential equations systems, J. Differential Equations, 32 (1979), 311-334. doi: 10.1016/0022-0396(79)90037-8.
[5]	F. Dumortier, J. Llibre and J. C. Artés, Qualitative Theorey of Planar Polynomial Systems, Springer, 2006.
[6]	B. García, J. Llibre and J. S. Pérea del Río, Planar quasi-homogeneous polynomial differential systems and their integrability, J. Differential Equations, 255 (2013), 3185-3204. doi: 10.1016/j.jde.2013.07.032.
[7]	L. Gavrilov, J. Giné and M. Grau, On the cyclicity of weight-homogeneous centers, J. Differential Equations, 246 (2009), 3126-3135. doi: 10.1016/j.jde.2009.02.010.
[8]	J. Giné, M. Grau and J. Llibre, Polynomial and rational first integrals for planar quasi-homogeneous polynomial differential systems, Discrete Contin. Dyn. Syst., 33 (2013), 4531-4547. doi: 10.3934/dcds.2013.33.4531.
[9]	J. Llibre and X. Zhang, Polynomial first integrals for quasi-homogeneous polynomial differential systems, Nonlinearity, 15 (2002), 1269-1280. doi: 10.1088/0951-7715/15/4/313.
[10]	J. Llibre and C. Pessoa, On the centers of the weight-homogeneous polynomial vector fields on the plane, J. Math. Anal. Appl., 359 (2009), 722-730. doi: 10.1016/j.jmaa.2009.06.036.
[11]	W. Li, J. Llibre, J. Yang and Z. Zhang, Limit cycles bifurcating from the period annulus of quasi-homogeneous centers, J. Dyn. Diff. Equat., 21 (2009), 133-152. doi: 10.1007/s10884-008-9126-1.
[12]	H. Liang, J. Huang and Y. Zhao, Classification of global phase portraits of planar quartic quasi-homogeneous polynomial differential systems, Nonlinear Dynamics, 78 (2014), 1659-1681. doi: 10.1007/s11071-014-1541-8.
[13]	P. Mardešić, C. Rousseau and B. Toni, Linearization of isochronous centers, J. Differential Equations, 121 (1995), 67-108. doi: 10.1006/jdeq.1995.1122.
[14]	Y. Zhao, Limit cycles for planar semi-quasi-homogeneous polynomial vector fields, J. Math. Anal. Appl., 397 (2013), 276-284. doi: 10.1016/j.jmaa.2012.07.060.

show all references

References:

[1]	W. Aziz, J. Llibre and C. Pantazi, Centers of quasi-homogeneous polynomial differential equations of degree three, Advances in Mathematics, 254 (2014), 233-250. doi: 10.1016/j.aim.2013.12.006.
[2]	A. Cima and J. Llibre, Algebraic and topological classification of the homogeneous cubic systems in the plane, J. Math. Anal. Appl., 147 (1990), 420-448. doi: 10.1016/0022-247X(90)90359-N.
[3]	T. Date and M. Lai, Canonical forms of real homogeneous quadratic transformations, J. Math. Anal. Appl., 56 (1976), 650-682. doi: 10.1016/0022-247X(76)90031-7.
[4]	T. Date, Classification and analysis of two-dimensional homogeneous quadratic differential equations systems, J. Differential Equations, 32 (1979), 311-334. doi: 10.1016/0022-0396(79)90037-8.
[5]	F. Dumortier, J. Llibre and J. C. Artés, Qualitative Theorey of Planar Polynomial Systems, Springer, 2006.
[6]	B. García, J. Llibre and J. S. Pérea del Río, Planar quasi-homogeneous polynomial differential systems and their integrability, J. Differential Equations, 255 (2013), 3185-3204. doi: 10.1016/j.jde.2013.07.032.
[7]	L. Gavrilov, J. Giné and M. Grau, On the cyclicity of weight-homogeneous centers, J. Differential Equations, 246 (2009), 3126-3135. doi: 10.1016/j.jde.2009.02.010.
[8]	J. Giné, M. Grau and J. Llibre, Polynomial and rational first integrals for planar quasi-homogeneous polynomial differential systems, Discrete Contin. Dyn. Syst., 33 (2013), 4531-4547. doi: 10.3934/dcds.2013.33.4531.
[9]	J. Llibre and X. Zhang, Polynomial first integrals for quasi-homogeneous polynomial differential systems, Nonlinearity, 15 (2002), 1269-1280. doi: 10.1088/0951-7715/15/4/313.
[10]	J. Llibre and C. Pessoa, On the centers of the weight-homogeneous polynomial vector fields on the plane, J. Math. Anal. Appl., 359 (2009), 722-730. doi: 10.1016/j.jmaa.2009.06.036.
[11]	W. Li, J. Llibre, J. Yang and Z. Zhang, Limit cycles bifurcating from the period annulus of quasi-homogeneous centers, J. Dyn. Diff. Equat., 21 (2009), 133-152. doi: 10.1007/s10884-008-9126-1.
[12]	H. Liang, J. Huang and Y. Zhao, Classification of global phase portraits of planar quartic quasi-homogeneous polynomial differential systems, Nonlinear Dynamics, 78 (2014), 1659-1681. doi: 10.1007/s11071-014-1541-8.
[13]	P. Mardešić, C. Rousseau and B. Toni, Linearization of isochronous centers, J. Differential Equations, 121 (1995), 67-108. doi: 10.1006/jdeq.1995.1122.
[14]	Y. Zhao, Limit cycles for planar semi-quasi-homogeneous polynomial vector fields, J. Math. Anal. Appl., 397 (2013), 276-284. doi: 10.1016/j.jmaa.2012.07.060.

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