Commensurators and classifying spaces with virtually cyclic stabilizers
Abstract
By examining commensurators of virtually cyclic groups, we show that for each natural number n, any locally finite-by-virtually cyclic group of cardinality alephn admits a finite dimensional classifying space with virtually cyclic stabilizers of dimension n+3. As a corollary, we prove that every elementary amenable group of finite Hirsch length and cardinality alephn admits a finite dimensional classifying space with virtually cyclic stabilizers.
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