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Local Integrability for Some Degenerate Nilpotent Vector Fields

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Nonlinear Systems, Vol. 1

Part of the book series: Understanding Complex Systems ((UCS))

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Abstract

This work is about the analytic integrability problem around the origin in a family of degenerate nilpotent vector fields. The integrability problem for planar vector fields with first Hamiltonian component having simple factors in its factorization on \(\mathbb {C}[x, y]\) is solved in Algaba et al. (Nonlinearity 22:395–420, 2009) [5]. Nevertheless, when the Hamiltonian function has multiple factors on \(\mathbb {C}[x, y]\) is an open problem. In this second case our problem is framed. More concretely, we study the following degenerate systems:

$$\begin{aligned} \dot{x} = - y (x^{2n}+ny^2)+ \cdots , \quad \dot{y}=x^{2n-1} (x^{2n}+ny^2)+\cdots , \end{aligned}$$

with \(n \in \mathbb {N}\), where its first quasi-homogeneous component has Hamiltonian function given by \((x^{2n}+ny^2)^2/(2n)\). The analytic integrability of the above system is not completely solved and only partial results are obtained. The results are applied to some particular families of degenerate vector fields for which the integrability problem is completely solved.

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Acknowledgements

The authors are supported by a MINECO/FEDER grant number MTM2014-56272-C2-02 and by the Consejería de Educación y Ciencia de la Junta de Andalucía (projects P12-FQM-1658, FQM-276).

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Correspondence to Isabel Checa .

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Algaba, A., Checa, I., García, C. (2018). Local Integrability for Some Degenerate Nilpotent Vector Fields. In: Carmona, V., Cuevas-Maraver, J., Fernández-Sánchez, F., García- Medina, E. (eds) Nonlinear Systems, Vol. 1. Understanding Complex Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-66766-9_8

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