Integrability of a linear center perturbed by a fourth degree homogeneous polynomial
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In this work we study the integrability of a two-dimensional autonomous system in the plane with linear part of center type and non-linear part given by homogeneous polynomials of fourth degree. We give sufficient conditions for integrability in polar coordinates. Finally we establish a conjecture about
the independence of the two classes of parameters which appear in the system; if this conjecture is true the integrable cases found will be the only possible ones.