Uniform Local Amenability implies Property A
Metric Geometry
2021-04-20 v3 Combinatorics
Abstract
In this short note we answer a query of Brodzki, Niblo, \v{S}pakula, Willett and Wright by showing that all bounded degree uniformly locally amenable graphs have Property A. For the second result of the note recall that Kaiser proved that if is a finitely generated group and is a Farber sequence of finite index subgroups, then the associated Schreier graph sequence is of Property A if and only if the group is amenable. We show however, that there exist a non-amenable group and a nested sequence of finite index subgroups such that , and the associated Schreier graph sequence is of Property A.
Cite
@article{arxiv.1912.00806,
title = {Uniform Local Amenability implies Property A},
author = {Gábor Elek},
journal= {arXiv preprint arXiv:1912.00806},
year = {2021}
}
Comments
to appear in the Proceedings of the American Mathematical Society