Exactness and uniform embeddability of discrete groups

Details Exactness and uniform embeddability of discrete groups Exactness and uniform embeddability of discrete groups

2003-09-09

arxiv.org/abs/math/0309166v1

Mathematics

Operator Algebras

20 pages, Latex

Scientific paper

We define a numerical quasi-isometry invariant of a finitely generated group,
whose values parametrize the difference between the group being uniformly
embeddable in a Hilbert space and the reduced C*-algebra of the group being
exact.

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