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arXiv 0802.2353math.DSmath.OA
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Bernoulli作用诱导的遍历次等价关系

Ergodic Subequivalence Relations Induced by a Bernoulli Action

Ionut Chifan, Adrian Ioana

摘要:

设$Γ$是可数群,用$\Cal S$表示Bernoulli作用$Γ\curvearrowright [0,1]^Γ$诱导的等价关系,其中$[0,1]^Γ$被赋予乘积Lebesgue测度.我们证明了对于$\Cal S$的任何次等价关系$\Cal R$,存在$[0,1]^Γ$的一个具有$\Cal R$ -不变可测集的划分$\{X_i\}_{i\geq 0}$,使得对每个$i\geq 1$,$\Cal R_{|X_0}$是超有限的,$\Cal R_{|X_i}$是强遍历的(因此是遍历的).

英文摘要:

Let $Γ$ be a countable group and denote by $\Cal S$ the equivalence relation induced by the Bernoulli action $Γ\curvearrowright [0,1]^Γ$, where $[0,1]^Γ$ 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 $[0,1]^Γ$ 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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