Abstract
We characterize the wandering sets of a Borel automorphismT as being precisely those sets which have measure zero for every non-atomic measure μ which is quasi-invariant and ergodic forT.
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References
Y. Katznelson and B. Weiss,The construction of quasi-invariant measures, Isr. J. Math.12 (1972), 1–4.
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B. Weiss,Orbit equivalence of non-singular actions, inThéorie Ergodique, Monog. 29, L'Enseignement Math., 1981, pp. 77–107.
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Shelah, S., Weiss, B. Measurable recurrence and quasi-invariant measures. Israel J. Math. 43, 154–160 (1982). https://doi.org/10.1007/BF02761726
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DOI: https://doi.org/10.1007/BF02761726