Class of the Infinitesimal Generator of a Diffeomorphism
نویسنده
چکیده
Let F be an analytic diffeomorphism in (C m , 0) tangent to the identity of order n. The infinitesimal generator of F is the formal vector field X such that Exp X = F. In this paper we provide an elementary proof of the fact that X belongs to the Gevrey class of order 1/n.
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تاریخ انتشار 2007