The group of reversible Turing machines and the torsion problem for $\Aut(A^{\mathbb{Z})$ and related topological fullgroups.
The group of reversible Turing machines and the torsion problem for $\Aut(A^{\mathbb{Z})$ and related topological fullgroups.
Stability of Hamiltonian systems which are close to integrable : introduction to KAM and Nekhoroshev theory