Analytic moduli for unfoldings of germs of generic analytic diffeomorphisms with a codimension parabolic point
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Abstract
Abstract In this paper we provide a complete modulus of analytic classification for germs of generic analytic families of diffeomorphisms which unfold a parabolic fixed point of codimension $k$ . We start by showing that a generic family can be ‘prepared’, i.e. brought to a prenormal form ${f}_{\epsilon } (z)$ in which the multi-parameter $\epsilon $ is almost canonical (up to an action of $ \mathbb{Z} / k \mathbb{Z} $ ). As in the codimension one case treated in P. Mardešić, R. Roussarie and C. Rousseau [Modulus of analytic classification for unfoldings of generic parabolic diffeomorphisms. Mosc. Math. J. 4 (2004), 455–498], we show that the Ecalle–Voronin modulus can be unfolded to give a complete modulus for such germs. For this purpose, we define unfolded sectors in $z$ -space that constitute natural domains on which the map ${f}_{\epsilon } $ can be brought to normal form in an almost unique way. The comparison of these normalizing changes of coordinates on the different sectors forms the analytic part of the modulus. This construction is performed on sectors in the multi-parameter space $\epsilon $ such that the closure of their union provides a neighborhood of the origin in parameter space.
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