Luigi CHIERCHIA

Dipartimento di Matematica, 
Universita' di Roma III
Largo San Leonardo Murialdo 1, 
00146 Roma Italie
luigi@matrm3.mat.uniroma3.it
 

Action stability in perturbations of properly degenerate Hamiltonian systems.

Abstract : Various stability and instability results (including Arnold diffusion) are proved in the context of perturbations of properly degenerate Hamiltonian systems.