Realization of 2-solvable nilpotent groups as groups of classes of homotopy self-equivalences

Let X be a 1-connected CW-complex of finite type and epsilon(#)(X) be the group of homotopy classes of self-equi valences of X which induce the identity on homotopy groups. In this paper, we prove that every finitely generated 2-solvable rational nilpotent group is realizable as epsilon(#) (X) where X is the rationalization of a 1-connected CW-complex of finite type. (C) 2007 Elsevier B.V. All rights reserved.