期刊
TOPOLOGY AND ITS APPLICATIONS
卷 154, 期 10, 页码 2173-2184出版社
ELSEVIER
DOI: 10.1016/j.topol.2006.02.010
关键词
Urysohn metric space; group of isometries; approximation with finite groups; Levy group; concentration of measure
We prove that the isometry group Iso(U) of the universal Urysohn metric space U equipped with the natural Polish topology is a Levy group in the sense of Gromov and Milman, that is, admits an approximating chain of compact (in fact, finite) subgroups, exhibiting the phenomenon of concentration of measure. This strengthens an earlier result by Vershik stating that Iso(U) has a dense locally finite subgroup. (C) 2007 Elsevier B.V. All rights reserved.
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