Non-positively curved aspects of Artin groups of finite type.
Bounded cohomology of subgroups of mapping class groups.
The Tits alternative for . I: Dynamics of exponentially-growing automorphisms.
A Bers-like proof of the existence of train tracks for free group automorphisms
Using Lipschitz distance on Outer space we give another proof of the train track theorem.
Stable actions of groups on real trees.
Bounding the complexity of simplicial group actions on trees.
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