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math.GR2005★ 82 cited
On the automorphism group of generalized Baumslag-Solitar groups
Gilbert Levitt
A generalized Baumslag-Solitar group (GBS group) is a finitely generated group which acts on a tree with all edge and vertex stabilizers infinite cyclic. We show that Out(G) ei…
math.GR2005
The outer space of a free product
Vincent Guirardel, Gilbert Levitt
We associate a contractible ``outer space'' to any free product of groups G=G_1*...*G_q. It equals Culler-Vogtmann space when G is free, McCullough-Miller space when no G_i is Z. O…