Geodesic
Arnold Diffusion. I: Announcement of Results
Contemporary Mathematics. Fundamental Directions, Proceedings of the International Conference on Differential and Functional-Differential Equations — Satellite of International Congress of Mathematicians ICM-2002 (Moscow, MAI, 11–17 August, 2002). Part 2, Tome 2 (2003), pp. 116-130

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We announce a proof of the existence of Arnold diffusion for a large class of small perturbations of integrable Hamiltonian systems with positive normal torsion in the case of time-periodic systems in two degrees of freedom and in the case of autonomous systems in three degrees of freedom. 
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     author = {J. N. Mather},
     title = {Arnold {Diffusion.} {I:} {Announcement} of {Results}},
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     url = {http://geodesic.mathdoc.fr/item/CMFD_2003_2_a7/}
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J. N. Mather. Arnold Diffusion. I: Announcement of Results. Contemporary Mathematics. Fundamental Directions, Proceedings of the International Conference on Differential and Functional-Differential Equations — Satellite of International Congress of Mathematicians ICM-2002 (Moscow, MAI, 11–17 August, 2002). Part 2, Tome 2 (2003), pp. 116-130. http://geodesic.mathdoc.fr/item/CMFD_2003_2_a7/