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Title:
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Center problem for systems with two monomial nonlinearities
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Author:
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Gasull i Embid, Armengol; Giné, Jaume; Torregrosa, Joan
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Notes:
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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.
The first and third authors are partially supported by the MINECO MTM2013-40998-P grant, the MINECO/FEDERUNAB13-4E-1604 grant and the AGAUR (Generalitat de Catalunya) 2014SGR568 grant. The second author is partially supported by the MINECO MTM2014-53703-P grant and the AGAUR (Generalitat de Catalunya) 2014SGR1204 grant. |
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Subject(s):
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-Nondegenerate center
-Poincaré--Lyapunov constants
-Darboux center
-Reversible center
-Holomorphic center
-Persistent center
-Matemàtica
-Mathematics |
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Rights:
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(c) American Institute of Mathematical Sciences, 2016
info:eu-repo/semantics/restrictedAccess |
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Document type:
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Article
Article - Published version |
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Published by:
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American Institute of Mathematical Sciences
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