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- W2950877912 abstract "Consider a countable group Gamma acting ergodically by measure preserving transformations on a probability space (X,mu), and let R_Gamma be the corresponding orbit equivalence relation on X. The following rigidity phenomenon is shown: there exist group actions such that the equivalence relation R_Gamma on X determines the group Gamma and the action (X,mu,Gamma) uniquely, up to finite groups. The natural action of SL_n(Z) on the n-torus R^n/Z^n, for n>2, is one of such examples. The interpretation of these results in the context of von Neumann algebras provides some support to the conjecture of Connes on rigidity of group algebras for groups with property T. Our rigidity results also give examples of countable equivalence relations of type II, which cannot be generated (mod 0) by a free action of any group. This gives a negative answer to a long standing problem of Feldman and Moore." @default.
- W2950877912 created "2019-06-27" @default.
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- W2950877912 date "1999-11-01" @default.
- W2950877912 modified "2023-09-23" @default.
- W2950877912 title "Orbit equivalence rigidity" @default.
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