Sharply multiply homogeneous permutations groups, and rational scale types.
Spectral deformations of automorphic functions over graphs of groups.
Strongly bounded automorphism groups
A group G is strongly bounded if every isometric action of G on a metric space has bounded orbits. We show that the automorphism groups of typical countable structures with the small index property are strongly bounded. In particular we show that this is the case when G is the automorphism group of the countable universal locally finite extension of a periodic abelian group.
Sur le groupe des automorphismes d'un groupoïde
Sur les automorphismes continus d'extensions transcendantes valuées.
Sur l'existence d'espaces affinés à groupes de translations non commutatifs