Some Properties of Subsets of Hyperbolic Groups
arXiv:math/0404473
Abstract
We present some results about quasiconvex subgroups of infinite index and their products. After that we extend the standard notion of a subgroup commensurator to an arbitrary subset of a group, and generalize some of the previously known results.
27 pages, 5 figures. Final version; a number of typos corrected in the replacement