Ergodic Subequivalence Relations Induced by a Bernoulli Action

Details Ergodic Subequivalence Relations Induced by a Bernoulli Action Ergodic Subequivalence Relations Induced by a Bernoulli Action

2008-02-16

arxiv.org/abs/0802.2353v1

Mathematics

Dynamical Systems

16 pages

Scientific paper

Let $\Gamma$ be a countable group and denote by $\Cal S$ the equivalence relation induced by the Bernoulli action $\Gamma\curvearrowright [0,1]^{\Gamma}$, where $[0,1]^{\Gamma}$ is endowed with the product Lebesgue measure. We prove that for any subequivalence relation $\Cal R$ of $\Cal S$, there exists a partition $\{X_i\}_{i\geq 0}$ of $[0,1]^{\Gamma}$ with $\Cal R$-invariant measurable sets such that $\Cal R_{|X_0}$ is hyperfinite and $\Cal R_{|X_i}$ is strongly ergodic (hence ergodic), for every $i\geq 1$.

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