Surgery on $\widetilde{\Bbb{SL}}\times\Bbb{E}^n$-manifolds
  We show that although closed $\widetilde{\Bbb{SL}}\times\Bbb{E}^n$-manifolds do not admit metrics of nonpositive sectional curvature, the arguments of Farrell and Jones can be extended to show that such manifolds are topologically rigid, if $n\geq2$. 
J.A.Hillman and S.K.Roushon