Abstract
A countable group Γ has property T of Kazhdan if and only if no measure preserving ergodic action of Γ has non-trivial asymptotically invariant sets.
References
D. A. KazhdanConnection of the dual space of a group with the structure of its closed subgroups, Funktional'nji Analizi Ego Prilozheniya1 (1967), 71–74.
K. Schmidt,Asymptotically invariant sequences and an action of SL (2,Z)on the 2-sphere, Israel J. Math.37 (1980), 193–208.
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Connes, A., Weiss, B. Property T and asymptotically invariant sequences. Israel J. Math. 37, 209–210 (1980). https://doi.org/10.1007/BF02760962
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DOI: https://doi.org/10.1007/BF02760962