We give here a counterexample to this conjecture. Let us note G the graph in Fig. 1 where the two vertices a are identified and then the two cycles (a, b, c, d). As easily checked, the number ofâ€¦ (More)

We give a topological framework for the study of Selaâ€™s limit groups: limit groups are limits of free groups in a compact space of marked groups. Many results get a natural interpretation in thisâ€¦ (More)