English

Weak Width of Subgroups

Group Theory 2016-01-01 v1

Abstract

We say that the weak width of an infinite subgroup HH of GG in GG is nn if there exists a collection of nn strongly essentially distinct conjugates {H,g11Hg1,,gn11Hgn1}\{ H, g_1^{-1} H g_1,\cdots, g_{n-1}^{-1} H g_{n-1} \} of HH in GG such that the intersection Hgi1HgiH \cap g_i^{-1} H g_i is infinite for all 1in11 \leq i \leq n-1 and nn is maximal possible. We prove that a quasiconvex subgroup of a negatively curved group has finite weak width in the ambient group. We also give examples demonstrating that height, width, and weak width are different invariants of a subgroup.

Keywords

Cite

@article{arxiv.1512.09185,
  title  = {Weak Width of Subgroups},
  author = {Rita Gitik},
  journal= {arXiv preprint arXiv:1512.09185},
  year   = {2016}
}
R2 v1 2026-06-22T12:20:38.863Z