A very short proof of Forester's rigidity result.
Limit groups and groups acting freely on -trees.
Dynamics of out on the boundary of outer space
Cœur et nombre d'intersection pour les actions de groupes sur les arbres
Actions of finitely generated groups on -trees
We study actions of finitely generated groups on -trees under some stability hypotheses. We prove that either the group splits over some controlled subgroup (fixing an arc in particular), or the action can be obtained by gluing together actions of simple types: actions on simplicial trees, actions on lines, and actions coming from measured foliations on -orbifolds. This extends results by Sela and Rips-Sela. However, their results are misstated, and we give a counterexample to their statements. ...
Monoïdes libres dans les groupes hyperboliques
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