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arXiv 1609.08053math.DSmath.CAmath.MGmath.NT
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Furstenberg关于$\times p$与$\times q$ -不变集交的猜想的证明

A proof of Furstenberg's conjecture on the intersections of $\times p$ and $\times q$-invariant sets

Meng Wu

摘要:

本文证明了Furstenberg(1969)的猜想:若$A,B\subset [0,1]$分别在$\times p \mod 1$和$\times q \mod 1$下闭不变,且若$\log p/\log q\notin \mathbb{Q}$,则对所有实数$u$和$v$,$$\dim_{\rm H}(uA+v)\cap B\le \max\{0,\dim_{\rm H}A+\dim_{\rm H}B-1\}.$$我们研究了$\mathbb{R}$上不可约自相似集的交,得到了这个结果.我们的方法还允许我们给任意片的平面自相似集满足SSC和某些自然的不可约条件的尺寸上界。

英文摘要:

We prove the following conjecture of Furstenberg (1969): if $A,B\subset [0,1]$ are closed and invariant under $\times p \mod 1$ and $\times q \mod 1$, respectively, and if $\log p/\log q\notin \mathbb{Q}$, then for all real numbers $u$ and $v$, $$\dim_{\rm H}(uA+v)\cap B\le \max\{0,\dim_{\rm H}A+\dim_{\rm H}B-1\}.$$ We obtain this result as a consequence of our study on the intersections of incommensurable self-similar sets on $\mathbb{R}$. Our methods also allow us to give upper bounds for dimensions of arbitrary slices of planar self-similar sets satisfying SSC and certain natural irreducible conditions.

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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