Abstract
This paper deals with the existence of Darboux first integrals for the planar polynomial differential systems \(\mathop x\limits^. \) = λ x−y +P n+1(x, y)+xF 2n (x, y), \(\mathop y\limits^. \) = x+λ y +Q n+1(x, y)+yF 2n (x, y), where P i (x, y), Q i (x, y) and F i (x, y) are homogeneous polynomials of degree i. Within this class, we identify some new Darboux integrable systems having either a focus or a center at the origin. For such Darboux integrable systems having degrees 5 and 9 we give the explicit expressions of their algebraic limit cycles. For the systems having degrees 3, 5, 7 and 9 and restricted to a certain subclass we present necessary and sufficient conditions for being Darboux integrable.
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Cao, J., Llibre, J. & Zhang, X. Darboux integrability and algebraic limit cycles for a class of polynomial differential systems. Sci. China Math. 57, 775–794 (2014). https://doi.org/10.1007/s11425-014-4772-8
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DOI: https://doi.org/10.1007/s11425-014-4772-8