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Título:	Lie symmetries and the center problem
Autor/a:	Giné, Jaume
Notas:	Abstract In this short survey we discuss the narrow relation between the center problem and the Lie symmetries. It is well known that an analytic vector field X having a non–degenerate center has a non–trivial analytic Lie symmetry in a neighborhood of it, i.e. there exists an analytic vector field Y such that [X,Y] = μX. The same happens for a nilpotent center with an analytic first integral as can be seen from the recent results about nilpotent centers. From the recent results for nilpotent and degenerate centers it also can be proved that any nilpotent or degenerate center has a trivial smooth (of class C1) Lie symmetry. It remains as open problem if there always exists also a non–trivial Lie symmetry for any nilpotent and degenerate center
Materia(s):	-Lie symmetries -Center problem -Vector fields -Matemàtica
Derechos:	cc-by (c) Giné, 2011 http://creativecommons.org/licenses/by/4.0/
Tipo de documento:	article publishedVersion
Editor:	Shanghai Normal University & Wilmington Scientific Publisher
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