A Universal Construction for Groups Acting Freely on Real Trees
A Universal Construction for Groups Acting Freely on Real Trees
£115.00
GBPThe theory of R-trees is a well-established and important area of geometric group theory and in this book the authors introduce a construction that provides a new perspective on group actions on R-trees. They construct a group RF(G), equipped with an action on an R-tree, whose elements are certain functions from a compact real interval to the group G. They also study the structure of RF(G), including a detailed description of centralizers of elements and an investigation of its subgroups and quotients. Any group acting freely on an R-tree embeds in RF(G) for some choice of G. Much remains to be done to understand RF(G), and the extensive list of open problems included in an appendix could potentially lead to new methods for investigating group actions on R-trees, particularly free actions. This book will interest all geometric group theorists and model theorists whose research involves R-trees.
- A coherent introduction to an exciting new area of research
- Contains many open problems to encourage further study
- The basic theory of Λ-trees is presented in an appendix
Product details
December 2012Adobe eBook Reader
9781139575232
0 pages
0kg
4 b/w illus. 65 exercises
This ISBN is for an eBook version which is distributed on our behalf by a third party.
Table of Contents
- Preface
- 1. Introduction
- 2. The group RF(G)
- 3. The R-tree XG associated with RF(G)
- 4. Free R-tree actions and universality
- 5. Exponent sums
- 6. Functoriality
- 7. Conjugacy of hyperbolic elements
- 8. The centralizers of hyperbolic elements
- 9. Test functions: basic theory and first applications
- 10. Test functions: existence theorem and further applications
- 11. A generalization to groupoids
- Appendix A. The basics of Λ-trees
- Appendix B. Some open problems
- References
- Index.
