Abstract
We give a nonlinear symplectic coordinator transformation, which can move the normal frequencies of the lower dimensional torus up to (k,w) where ω is the frequency vector of the torus. That means the normal frequencies with a difference (k,w) may be regarded as the same. As an application, we derive a persistence result on lower dimensional tori of nearly integrable Hamiltonian systems when the second Melnikov’s condition is partially violated.
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Xu, J., You, J. A symplectic map and its application to the persistence of lower dimensional invariant tori. Sci. China Ser. A-Math. 45, 598–603 (2002). https://doi.org/10.1360/02ys9064
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DOI: https://doi.org/10.1360/02ys9064