Abelian integrals of quadratic hamiltonian vector fields with an invariant straight line

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C. Li
Jaume Llibre
Z. Zhang
We prove that the lowest upper bound for the number of isolated zeros of the Abelian integrals associated to quadratic Hamiltonian vector fields having a center and an invariant straight line after quadratic perturbations is one.

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Li, C. et al. «Abelian integrals of quadratic hamiltonian vector fields with an invariant straight line». Publicacions Matemàtiques, 1995, vol.VOL 39, núm. 2, p. 355-66, http://raco.cat/index.php/PublicacionsMatematiques/article/view/37843.

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