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math.DS2021★ 1 cited
KAM below
Jürgen Pöschel
We consider the KAM theory for rotational flows on an -dimensional torus. We show that if its frequencies are diophantine of type , then Moser's KAM theory with parameters…
math.DS2017
On the Siegel-Sternberg linearization theorem
Jürgen Pöschel
We establish a general version of the Siegel-Sternberg linearization theorem for ultradiffentiable maps which includes the analytic case, the smooth case and the Gevrey case. It ma…