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A note on bounded exponential sums
Bulletin of the London Mathematical Society ( IF 0.9 ) Pub Date : 2020-11-11 , DOI: 10.1112/blms.12431 Reynold Fregoli 1
Bulletin of the London Mathematical Society ( IF 0.9 ) Pub Date : 2020-11-11 , DOI: 10.1112/blms.12431 Reynold Fregoli 1
Affiliation
Let , , and for . We set
Recently, A'Campo posed the following question: Is there an infinite non‐cofinite set such that for all the sum has bounded modulus as ? In this note, we show that such sets do not exist. To do so, we use a theorem by Duffin and Schaeffer on complex power series. We extend our result by proving that if the sum is bounded in modulus on an arbitrarily small interval and on the set of rational points, then the set has to be either finite or cofinite. On the other hand, we show that there are infinite non‐cofinite sets such that is bounded independently of for all , where and has full Hausdorff dimension.
中文翻译:
关于有界指数和的注记
让 , , 和 为了 。我们设置
最近,A'Campo提出了以下问题:是否存在无限的非限定集 这样对于所有人 总和 的边界模量为 ?在本说明中,我们表明此类集合不存在。为此,我们使用Duffin和Schaeffer的关于复数幂级数的定理。通过证明如果求和 在任意小的间隔和有理点集上的模数范围内 必须是有限的或有限的。另一方面,我们表明有无限的非定集 这样 不受限制 对全部 , 在哪里 和 具有完整的Hausdorff尺寸。
更新日期:2020-11-11
中文翻译:
关于有界指数和的注记
让 , , 和 为了 。我们设置