%0 Journal Article %T Arnold Diffusion in a priory chaotic Hamiltonian systems %A Vassily Gelfreich %A Dmitry Turaev %J Mathematics %D 2014 %I arXiv %X We assume that a symplectic real-analytic map has an invariant normally hyperbolic cylinder and an associated transverse homoclinic cylinder. It is well known that such cylinder is preserved under small perturbations. We prove that for a generic real- analytic perturbation of this map the boundaries of the cylinder are connected by trajectories of the perturbed map. %U http://arxiv.org/abs/1406.2945v2