06035468

j

06035468 Khukhro, Ana Wright, Nick J. Expanders and property A. Algebr. Geom. Topol. 12, No. 1, 37-47 (2012). 2012 Geometry \& Topology Publications, Mathematics Institute, University of Warwick, Coventry; Mathematical Sciences Publishers, Berkeley, CA EN expanders Yu's property A generalised cohomology

doi:10.2140/agt.2012.12.37

Summary: 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.