Abstract
The mapping version of Pöschel's theory on differentiable foliation structures of invariant tori is presented and the relevant estimates explicitly in terms of the diophantine constant and the nondegeneracy parameters of frequency maps are given. As a direct application of the main result, a generalization of Moser's small twist theorem to high dimensions is given.
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Shang, Zj. A Note on the KAM Theorem for Symplectic Mappings. Journal of Dynamics and Differential Equations 12, 357–383 (2000). https://doi.org/10.1023/A:1009068425415
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DOI: https://doi.org/10.1023/A:1009068425415