English

Arbitrary residual finiteness and conjugacy separability growth

Group Theory 2024-10-16 v1

Abstract

In a recent paper, Henry Bradford showed that all sufficiently fast growing functions appear as the residual finiteness growth function of some group. In this paper we show that the groups there constructed are conjugacy separable and that their conjugacy separability growth is equal to the residual finiteness growth. It follows that all sufficiently fast growing functions appear as the conjugacy separability growth function of some group. We extend this construction to a new class of groups such that given functions f1,f2f_1,f_2 under the same constraints and satisfying f2f1f_2\geq f_1, we can find a group such that the residual finiteness growth is given by f1f_1 and the conjugacy separability growth by f2f_2, showing that the residual finiteness growth and conjugacy separability growth behave independently and can lie arbitrarily far apart.

Keywords

Cite

@article{arxiv.2410.11667,
  title  = {Arbitrary residual finiteness and conjugacy separability growth},
  author = {Lukas Vandeputte},
  journal= {arXiv preprint arXiv:2410.11667},
  year   = {2024}
}

Comments

17 pages

R2 v1 2026-06-28T19:22:42.818Z