Actions of maximal growth of hyperbolic groups.
Mon, 01/09/2012 - 15:01 — SomNambul
link: http://arxiv.org/abs/1201.1349
Abstract
Abstract
We prove that every non-elementary hyperbolic group $G$ acts with maximal
growth on some set $X$ such that every orbit of any element $g \in G$ is
finite. As a side-product of our approach we prove that if $G$ is
non-elementary hyperbolic, $\HH \leq G$ is quasiconvex of infinite index then
there exists $g \in G$ such that $<\HH,g>$ is quasiconvex of infinite index and
is isomorphic to $\HH*<g >$ if and only if $\HH \cap E(G)= \{e\} $, where
$E(G)$ is the maximal finite normal subgroup of $G$.
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