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ANALYTIC REDUCIBILITY OF RESONANT COCYCLES TO A NORMAL FORM

Published online by Cambridge University Press:  27 November 2014

Claire Chavaudret
Affiliation:
Laboratoire J.-A. Dieudonné, U.M.R. 6621, Université de Nice - Sophia Antipolis, Parc Valrose 06108 Nice Cedex 02, France ([email protected])
Laurent Stolovitch
Affiliation:
CNRS and Laboratoire J.-A. Dieudonné U.M.R. 6621, Université de Nice - Sophia Antipolis, Parc Valrose 06108 Nice Cedex 02, France ([email protected])

Abstract

We consider systems of quasi-periodic linear differential equations associated to a ‘resonant’ frequency vector ${\it\omega}$, namely, a vector whose coordinates are not linearly independent over $\mathbb{Z}$. We give sufficient conditions that ensure that a small analytic perturbation of a constant system is analytically conjugate to a ‘resonant cocycle’. We also apply our results to the non-resonant case: we obtain sufficient conditions for reducibility.

Type
Research Article
Copyright
© Cambridge University Press 2014 

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