Mathematics – Group Theory
Scientific paper
2006-04-06
Mathematics
Group Theory
12 pages; key words: uniform lattice, virtually free group, totally disconnected group, scale function (Error in references co
Scientific paper
Let $\Gamma$ be a group which is virtually free of rank at least 2 and let $\mathcal{F}_{td}(\Gamma)$ be the family of totally disconnected, locally compact groups containing $\Gamma$ as a co-compact lattice. We prove that the values of the scale function with respect to groups in $\mathcal{F}_{td}(\Gamma)$ evaluated on the subset $\Gamma$ have only finitely many prime divisors. This can be thought of as a uniform property of the family $\mathcal{F}_{td}(\Gamma)$.
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