Every finite complex is the classifying space for proper bundles of a virtual Poincar\'e duality group

摘要

We prove that every finite connected simplicial complex is homotopyequivalent to the quotient of a contractible manifold by proper actions of avirtually torsion-free group. As a corollary, we obtain that every finiteconnected simplicial complex is homotopy equivalent to the classifying spacefor proper bundles of some virtual Poincar\'e duality group.