Abstract
In this note we provide a sufficient condition on the existence of Darboux polynomials of polynomial differential systems via existence of Jacobian multiplier or of Liouvillian first integral and a degree condition among different components of the system. As an application of our main results we prove that the Liénard polynomial differential system \(\dot{x}=y,\, \dot{y}=-f(x)y-g(x)\) with \(\deg f>\deg g\) is not Liouvillian integrable.
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Acknowledgments
J. Llibre is partially supported by a MINECO Grant MTM2013-40998-P, an AGAUR Grant Number 2014SGR-568, and the Grants FP7-PEOPLE-2012-IRSES 318999 and 316338. C. Valls is supported by Portuguese national funds through FCT—Fundação para a Ciência e a Tecnologia: project PEst-OE/EEI/LA0009/2013 (CAMGSD). X. Zhang is partially supported by NNSF of China Grant Numbers 11271252 and 11671254, by RFDP of Higher Education of China Grant Number 20110073110054, and by FP7-PEOPLE-2012-IRSES-316338 of Europe. This work was done during a visit of the C. Valls and X. Zhang to the Universitat Autònoma de Barcelona. We appreciate their support and hospitality. We thank to the reviewer his/her comments which help us to improve the presentation of this paper.
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Llibre, J., Valls, C. & Zhang, X. Liouvillian Integrability Versus Darboux Polynomials. Qual. Theory Dyn. Syst. 15, 503–515 (2016). https://doi.org/10.1007/s12346-016-0212-1
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DOI: https://doi.org/10.1007/s12346-016-0212-1
Keywords
- Polynomial differential system
- Liouvillian integrability
- Darboux Jacobian multiplier
- Darboux polynomial