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Indira Chatterji (Université Côte d'Azur)
The first ell-two Betti number and groups acting on trees
I will discuss a joint work with Sam Hughes and Peter Kropholler, in which we generalize
results of Thomas, Allcock, Thom–Petersen, and Kar–Niblo to the first ell 2 Betti number of
quotients of certain groups acting on trees by subgroups with free actions on the edge sets of