Journal of the London Mathematical Society Advance Access originally published online on October 18, 2007
Journal of the London Mathematical Society 2007 76(2):479-497; doi:10.1112/jlms/jdm066
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© 2007 London Mathematical Society
Property A, partial translation structures, and uniform embeddings in groups
School of Mathematics
University of Southampton
Highfield
Southampton SO17 1BJ
United Kingdom
j.brodzki@soton.ac.uk
wright@soton.ac.uk
We define the concept of a partial translation structure
on a metric space X and show that there is a natural C*-algebra C*(
) associated with it, which is a subalgebra of the uniform Roe algebra C*u(X). We introduce a coarse invariant of the metric which provides an obstruction to embedding the space in a group. When the space is sufficiently group-like, as determined by our invariant, properties of the Roe algebra can be deduced from those of C*(
). We also give a proof of the fact that the uniform Roe algebra of a metric space is a coarse invariant up to Morita equivalence.
2000 Mathematics Subject Classification 46L85, 20F65, 54E35.
Received March 24, 2006; revised February 7, 2007; published online October 18, 2007.