02-85 B. Gr bert and T. Kappeler
Perturbations of the defocusing NLS equation (76K, Latex2e) Feb 26, 02
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Abstract. We prove that many finite dimensional tori, invariant under the flow of the defocusing nonlinear Schr\"odinger equation, persist under small Hamiltonian perturbations.These invariant tori are not necessarily close to the zero solution.

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