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Integrability conditions for Lotka–Volterra planar complex quintic systems

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Issue date
2010
Author
Giné, Jaume
Romanovski, Valery G.
Suggested citation
Giné, Jaume; Romanovski, Valery G.; . (2010) . Integrability conditions for Lotka–Volterra planar complex quintic systems. Nonlinear Analysis: Real World Applications, 2010, vol. 11, núm. 3, p. 2100-2105. https://doi.org/10.1016/j.nonrwa.2009.06.002.
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Abstract
In this paper we obtain necessary and sufficient integrability conditions at the origin for the Lotka–Volterra complex quintic systems which are linear systems perturbed by fifth degree homogeneous polynomials, i.e., we consider systems of the form View the MathML sourceẋ=x(1−a40x4−a31x3y−a22x2y2−a13xy3−a04y4), View the MathML sourceẏ=−y(1−b40x4−b31x3y−b22x2y2−b13xy3−b04y4). The necessity of these conditions is derived from the first nine focus-saddle quantities and their sufficiency is proved by finding an inverse integrating factor or a first integral.
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http://hdl.handle.net/10459.1/58671
DOI
https://doi.org/10.1016/j.nonrwa.2009.06.002
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Nonlinear Analysis: Real World Applications, 2010, vol. 11, núm. 3, p. 2100-2105
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