On the Dimension of Iterated Sumsets
On the Dimension of Iterated Sumsets
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关于迭代和集的维数
DOI:
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发表时间:
2009
期刊:
影响因子:
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通讯作者:
Pablo Shmerkin
中科院分区:
文献类型:
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作者:
J. Schmeling;Pablo Shmerkin
Let A be a subset of the real line. We study the fractal dimensions of the k-fold iterated sumsets kA, defined as
$$kA ={ {a}_{1} + cdots + {a}_{k} : {a}_{i} in A}.$$
We show that for any nondecreasing sequence {α k }k = 1 ∞ taking values in [0, 1], there exists a compact set A such that kA has Hausdorff dimension α k for all k ≥ 1. We also show how to control various kinds of dimensions simultaneously for families of iterated sumsets. These results are in stark contrast to the Plunnecke–Ruzsa inequalities in additive combinatorics. However, for lower box-counting dimensions, the analog of the Plunnecke–Ruzsa inequalities does hold.