Action de derivations irreductibles sur les algebres quasi-regulieres d'Hilbert

Details Action de derivations irreductibles sur les algebres quasi-regulieres d'Hilbert Action de derivations irreductibles sur les algebres quasi-regulieres d'Hilbert

2009-12-08

arxiv.org/abs/0912.1560v1

Mathematics

Dynamical Systems

Amstex, 94 pages

Scientific paper

We study the action of irreducible derivations X on some Hilbert's quasi-regular algebras QRH of germes at 0 of analytic functions on (U,0), where U is a semi-algebraic set: that is, we show that these algebras are X-finite or locally X-finite, ie. the degre of the integral projection is finite by restriction to fibers of elements of QRH, and the differential ideals are noetherian or locally noetherian. We then give an important application of this material to the Hilbert's 16th problem about limit cycles: there is no accumulation of limit cycles on hyperbolic polycycles, inside compact analytic families of vector fields on the 2-sphere. This is a highly non trivial result as it includes the case of polycycle that is an accumulation of cycles.

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