A Comparison of Large Scale Dimension of a Metric Space to the Dimension of its Boundary

Buyalo and Lebedeva have shown that the asymptotic dimension of a hyperbolic group is equal to the dimension of the group boundary plus one. Among the work presented here is a partial extension of that result to all groups admitting $\mathcal{Z}$-structures; in particular, we show that $\hbox{asdim}G\geq \hbox{dim}Z+1$where$Z$isthe$$\mathcal{Z}$$-boundary.