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arXiv 2102.03680math.MGmath.PR
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平行集的反向等周不等式

Reverse isoperimetric inequalities for parallel sets

Piotr Nayar

摘要:

我们考虑$\mathbb{R}^d$中的$r$ -平行集族,即$A_r=A+rB_2^n$形式的集,其中$B_2^n$是单位欧氏球,$A$是任意Borel集.证明了$r$ -平行集的上表面积测度与其体积之比的上界为$d/r$ .当$A$为单点时,实现相等。作为我们的主要结果的结果,我们表明,高斯上表面积测量的$r$ -平行集是上界的$18d \max(\sqrt{d},r^{-1})$。此外,我们观察到存在一个$1$ -平行集,其高斯表面积测度至少为$0.28 \cdot d^{1/4}$ .

英文摘要:

We consider the family of $r$-parallel sets in $\mathbb{R}^d$, that is sets of the form $A_r=A+rB_2^n$, where $B_2^n$ is the unit Euclidean ball and $A$ is an arbitrary Borel set. We show that the ratio between the upper surface area measure of an $r$-parallel set and its volume is upper bounded by $d/r$. Equality is achieved for $A$ being a single point. As a consequence of our main result we show that the Gaussian upper surface area measure of an $r$-parallel set is upper bounded by $18d \max(\sqrt{d},r^{-1})$. Moreover, we observe that there exists a $1$-parallel set with Gaussian surface area measure at least $0.28 \cdot d^{1/4}$.

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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