Universal Borel actions of countable groups (Q426209)
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scientific article; zbMATH DE number 6045086
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Universal Borel actions of countable groups |
scientific article; zbMATH DE number 6045086 |
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Universal Borel actions of countable groups (English)
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11 June 2012
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Summary: If the countable group \(G\) has a nonabelian free subgroup, then there exists a standard Borel \(G\)-space such that the corresponding orbit equivalence relation is countable universal. In this paper, we consider the question of whether the converse also holds.
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Borel equivalence relation
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superrigidity
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sofic groups
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