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arXiv 1102.1072math.DS
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Cantor空间上的无穷测度

Infinite measures on Cantor spaces

Olena Karpel

摘要:

研究了Cantor空间X上所有无限满非原子Borel测度的集合$M_\infty(X)$.对于来自$M_\infty(X)$的度量$μ$,我们定义一个缺陷集$M_μ= \{x \in X : for any clopen set U which contains x we have μ(U) = \infty \}$。如果$μ(M_μ) = 0$,则我们将来自$M_\infty(X)$的度量称为无缺陷($μ\in M_\infty^0(X)$)的$μ$。本文致力于分类措施$μ$从$M_\infty^0(X)$关于同胚。为无缺陷度量$μ$定义了优度和闭合值集$S(μ)$的概念。给出了两个良非亏损测度同胚的一个判别准则,证明了在Cantor空间上存在弱同胚良非亏损测度的连续类。对于任何类群子集$D \subset [0,\infty)$,我们在Cantor空间X上找到一个好的非亏损测度$μ$,其中X具有$S(μ) = D$和一个保持$μ$的非周期同胚。非简单平稳Bratteli图上的无穷遍历R-不变测度集PDMATHAMV由非亏损测度组成。对于$μ\in S$,集合$S(μ)$是类群的,证明了这类测度的一个优度准则.我们证明了一个同胚类的一个好的措施,从$S$包含可数许多不同的好措施,从$S$。

英文摘要:

We study the set $M_\infty(X)$ of all infinite full non-atomic Borel measures on a Cantor space X. For a measure $μ$ from $M_\infty(X)$ we define a defective set $M_μ= \{x \in X : for any clopen set U which contains x we have μ(U) = \infty \}$. We call a measure $μ$ from $M_\infty(X)$ non-defective ($μ\in M_\infty^0(X)$) if $μ(M_μ) = 0$. The paper is devoted to the classification of measures $μ$ from $M_\infty^0(X)$ with respect to a homeomorphism. The notions of goodness and clopen values set $S(μ)$ are defined for a non-defective measure $μ$. We give a criterion when two good non-defective measures are homeomorphic and prove that there exist continuum classes of weakly homeomorphic good non-defective measures on a Cantor space. For any group-like subset $D \subset [0,\infty)$ we find a good non-defective measure $μ$ on a Cantor space X with $S(μ) = D$ and an aperiodic homeomorphism of X which preserves $μ$. The set $S$ of infinite ergodic R-invariant measures on non-simple stationary Bratteli diagrams consists of non-defective measures. For $μ\in S$ the set $S(μ)$ is group-like, a criterion of goodness is proved for such measures. We show that a homeomorphism class of a good measure from $S$ contains countably many distinct good measures from $S$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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