Configuration sets; a right place for ping-pong arguments

Document Type : Full Length Article

Author

Department of Mathematics, Faculty of Science, Shahid Rajaee Teacher Training University

Abstract

Giving a condition for the amenability of groups, Rosenblatt and Willis first introduced
the concept of configuration. In this paper, we investigate the relationship between ping-pong lemma and configuration sets, and show that only one configuration set is enough to ensure that several elements in a group generates a free subgroup of that group. Using only one two-sided configuration sets, we give, in a sense, a generalization of this result to polycyclic or FC-groups. Finiteness and paradoxical decompositions of groups, are other properties which can be characterized with only one configuration set.

Graphical Abstract

Configuration sets; a right place for ping-pong arguments

Keywords

Main Subjects


Volume 9, Issue 3
September 2024
Pages 191-202
  • Receive Date: 06 August 2024
  • Revise Date: 28 August 2024
  • Accept Date: 30 August 2024
  • Publish Date: 01 September 2024