Center problem for systems with two monomial nonlinearities

Gasull i Embid, Armengol; Giné, Jaume; Torregrosa, Joan

doi:https://doi.org/10.3934/cpaa.2016.15.577

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Issue date

2016

Author

Gasull i Embid, Armengol

Giné, Jaume

Torregrosa, Joan

Abstract

We study the center problem for planar systems with a linear center at the origin that in complex coordinates have a nonlinearity formed by the sum of two monomials. Our first result lists several centers inside this family. To the best of our knowledge this list includes a new class of Darboux centers

that are also persistent centers. The rest of the paper is dedicated to try to prove that the given list is exhaustive. We get several partial results that seem to indicate that this is the case. In particular, we solve the question for several general families with arbitrary high degree and for all cases of degree less or equal than 19. As a byproduct of our study we also obtain the highest known order for weak-foci of planar polynomial systems of some given degrees.

URI

http://hdl.handle.net/10459.1/58414

DOI

https://doi.org/10.3934/cpaa.2016.15.577

Is part of

Communications on Pure and Applied Analysis, 2016, vol. 15, núm. 2, p. 577-598