Volume 12, issue 1 (2012)
Download this article
Download this article For screen
For printing
Recent Issues

Volume 25, 1 issue

Volume 24, 9 issues

Volume 23, 9 issues

Volume 22, 8 issues

Volume 21, 7 issues

Volume 20, 7 issues

Volume 19, 7 issues

Volume 18, 7 issues

Volume 17, 6 issues

Volume 16, 6 issues

Volume 15, 6 issues

Volume 14, 6 issues

Volume 13, 6 issues

Volume 12, 4 issues

Volume 11, 5 issues

Volume 10, 4 issues

Volume 9, 4 issues

Volume 8, 4 issues

Volume 7, 4 issues

Volume 6, 5 issues

Volume 5, 4 issues

Volume 4, 2 issues

Volume 3, 2 issues

Volume 2, 2 issues

Volume 1, 2 issues

The Journal
About the Journal
Editorial Board
Subscriptions
 
Submission Guidelines
Submission Page
Policies for Authors
Ethics Statement
 
ISSN 1472-2739 (online)
ISSN 1472-2747 (print)
Author Index
To Appear
 
Other MSP Journals
Expanders and property A

Ana Khukhro and Nick J Wright
Algebraic & Geometric Topology 12 (2012) 37–47
DOI: 10.2140/agt.2012.12.37
Abstract

We give a cohomological characterisation of expander graphs, and use it to give a direct proof that expander graphs do not have Yu’s property A.

Keywords
expanders, Yu's property A, generalised cohomology
Mathematical Subject Classification 2010
Primary: 20F65, 20F69, 51F99, 55N20
Secondary: 05C80, 43A07, 55B20, 68R10
References
Publication
Received: 22 August 2011
Revised: 3 October 2011
Accepted: 4 October 2011
Published: 18 January 2012
Authors
Ana Khukhro
School of Mathematics
University of Southampton
University Road
Southampton
SO17 1BJ
UK
Nick J Wright
School of Mathematics
University of Southampton
University Road
Southampton
SO17 1BJ
UK