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arXiv 1807.02664math.MGmath.CA
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关于拓扑维数、Hausdorff测度和可求正性的注记

A note on topological dimension, Hausdorff measure, and rectifiability

Guy C. David, Enrico Le Donne

摘要:

本文的目的是对一般度量空间记录David Bate最近的一个结果的一个推论。证明了如下事实:设$X$是拓扑维数为$n$的紧度量空间.设$X$的$n$维Hausdorff测度$\mathcal H^n(X)$是有限的.进一步假设测度$\mathcal H^n$的低n-密度是正的,$\mathcal H^n$ -几乎在$X$中的任何地方。则$X$包含正$\mathcal H^n$ -测度的$n$ -可求长子集.此外,如果使用最近宣布的Csörnyei-Jones的结果,则不需要对较低密度的假设。

英文摘要:

The purpose of this note is to record a consequence, for general metric spaces, of a recent result of David Bate. We prove the following fact: Let $X$ be a compact metric space of topological dimension $n$. Suppose that the $n$-dimensional Hausdorff measure of $X$, $\mathcal H^n(X)$, is finite. Suppose further that the lower n-density of the measure $\mathcal H^n$ is positive, $\mathcal H^n$-almost everywhere in $X$. Then $X$ contains an $n$-rectifiable subset of positive $\mathcal H^n$-measure. Moreover, the assumption on the lower density is unnecessary if one uses recently announced results of Csörnyei-Jones.

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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