Examples of hyperlinear groups without factorization property

Details Examples of hyperlinear groups without factorization property Examples of hyperlinear groups without factorization property

2008-10-13

arxiv.org/abs/0810.2180v1

Mathematics

Group Theory

14 pages, no figures

Scientific paper

In this note we give an example of a group which is locally embeddable into finite groups (in particular it is initially subamenable, sofic and hence hyperlinear) but does not have Kirchberg's factorization property. This group provides also an example of a sofic Kazhdan group which is not residually finite, answering a question of Elek and Szabo. We also give an example of a group which is not initially subamenable but hyperlinear. Finally, we point out a mistake in an assertion of Kirchberg and provide an example of a group which does not have the factorization property and is still a subgroup of a connected finite-dimensional Lie group.

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