The complex of HNN-extensions for free groups of rank n
Suhas J Pandit
ICTP, Trieste, Italy.
In this talk, we shall discuss the complex of HNN - extensions for free groups of finite rank. We shall sketch a proof the following result " The group of simplicial automorphisms of this complex is isomorphic to the group Out(F_n) of outer automorphisms of the free group F_n of rank n.