Amenable actions of nonamenable groups |
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Authors: | R. Grigorchuk V. Nekrashevych |
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Affiliation: | (1) Texas A&M University, USA |
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Abstract: | We present two methods of constructing amenable (in the sense of Greenleaf) actions of nonamenable groups. In the first part of the paper, we construct a class of faithful transitive amenable actions of the free group using Schreier graphs. In the second part, we show that every finitely generated residually finite group can be embedded into a bigger residually finite group, which acts level-transitively on a locally finite rooted tree, so that the induced action on the boundary of the tree is amenable on every orbit. Bibliography: 25 titles. Published in Zapiski Nauchnykh Seminarov POMI, Vol. 326, 2005, pp. 85–96. |
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