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arXiv 1801.02564math.FAcs.ITmath.ITmath.NT
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采样概周期及相关函数

Sampling Almost Periodic and related Functions

Stefano Ferri, Jorge Galindo, Camilo Gómez

摘要:

我们考虑某些有限集的圆值函数定义的区间上的实数和估计多大的间隔必须为这些功能的值是均匀分布的近似方法。这是用来建立一些一般性的条件下,随机建设介绍了卡茨纳尔逊的整数产量集是密集的玻尔群。我们以这种方式获得非常稀疏的实数集(和整数)上的两个不同的殆周期函数不能同意,是什么使他们适合被用于这些功能的采样定理。这些集合可以稀疏到具有零渐近密度或成为t-集合,即,在一个有界集中与它们的任何平移相交的集合。这些结果中的许多不仅证明了殆周期函数,但也为更一般的复杂指数函数,包括啁啾产生的函数类。

英文摘要:

We consider certain finite sets of circle-valued functions defined on intervals of real numbers and estimate how large the intervals must be for the values of these functions to be uniformly distributed in an approximate way. This is used to establish some general conditions under which a random construction introduced by Katznelson for the integers yields sets that are dense in the Bohr group. We obtain in this way very sparse sets of real numbers (and of integers) on which two different almost periodic functions cannot agree, what makes them amenable to be used in sampling theorems for these functions. These sets can be made as sparse as to have zero asymptotic density or as to be t-sets, i.e., to be sets that intersect any of their translates in a bounded set. Many of these results are proved not only for almost periodic functions but also for classes of functions generated by more general complex exponential functions, including chirps.

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