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Zoekopdracht: faculteit: "FEB" en publicatiejaar: "2009"

AuteurF. Wagener
TitelA parametrised version of Moser's modifying terms theorem
SerietitelCeNDEF Working Paper University of Amsterdam
FaculteitFaculteit Economie en Bedrijfskunde
Instituut/afd.FEB: Amsterdam School of Economics Research Institute (ASE-RI)
SamenvattingA sharpened version of Moser's `modifying terms' KAM theorem is derived, and it is shown how this theorem can be used to investigate the persistence of invariant tori in general situations, including those where some of the Floquet exponents of the invariant torus may vanish. The result is `structural' and works for dissipative, Hamiltonian, reversible and symmetric vector fields. These results are derived for the contexts of real analytic, Gevrey
regular, ultradifferentiable and finitely differentiable perturbed vector fields. In the first two cases, the conjugacy constructed in the theorem is shown to be Gevrey smooth in the sense of Whitney on the set of parameters satisfying a "Diophantine" non-resonance condition.
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