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Phase portraits of the quadratic vector fields with a polynomial first integral

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Abstract

In this work we classify the phase portraits of all quadratic polynomial differential systems having a polynomial first integral.

IfH(x, y) is a polynomial of degreen+1 then the differential systemx′=−∂H/∂y,y′=∂H/∂x is called a Hamiltonian system of degreen. We also prove that all the phase portraits that we obtain in this paper are realizable by Hamiltonian systems of degree 2.

Since we observe that all the phase portraits of the linear polynomial differential systems having a polynomial first integral are also realizable by Hamiltonian systems of degree 1, an open question appears: Are all the phase portraits of polynomial differential systems of degreen having a polynomial first integral realizable by Hamiltonian systems of degreen?

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Correspondence to Belén García.

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The first and third authors are supported by a MEC grant number MTM 2005-02094. The second author is partially supported by a DGICYT grant number MTM2005-06098-C02-01 and by a CICYT grant number 2005SGR 00550.

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García, B., Pérez Del Río, J.S. & Llibre, J. Phase portraits of the quadratic vector fields with a polynomial first integral. Rend. Circ. Mat. Palermo 55, 420–440 (2006). https://doi.org/10.1007/BF02874780

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  • DOI: https://doi.org/10.1007/BF02874780

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