Conjugacy Growth in Polycyclic Groups

Details Conjugacy Growth in Polycyclic Groups Conjugacy Growth in Polycyclic Groups

2010-06-05

arxiv.org/abs/1006.1064v1

Mathematics

Group Theory

4 pages

Scientific paper

In this paper, we consider the conjugacy growth function of a group, which counts the number of conjugacy classes which intersect a ball of radius $n$ centered at the identity. We prove that in the case of virtually polycyclic groups, this function is either exponential or polynomially bounded, and is polynomially bounded exactly when the group is virtually nilpotent. The proof is fairly short, and makes use of the fact that any polycyclic group has a subgroup of finite index which can be embedded as a lattice in a Lie group, as well as exponential radical of Lie groups and Dirichlet's approximation theorem.

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