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The action of |
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| Authors: | Su Gao |
| Affiliation: | Department of Mathematics, California Institute of Technology, Pasadena, California 91125 |
| Abstract: | We prove that the orbit equivalence relation of the canonical action of  on the subsets of  is a universal countable Borel equivalence relation. |
| Keywords: | Borel reducibility universal countable Borel equivalence relation free group free action |
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