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Article . 2022
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A NOTE ON UNIFORM STATISTICAL LIMIT POINTS

A note on uniform statistical limit points
Authors: Miller-Van Wieren, Leila; Yurdakadim, Tugba;

A NOTE ON UNIFORM STATISTICAL LIMIT POINTS

Abstract

Let \(K\subset \mathbb{N}\) and denote by \(K(m,n)\) the cardinality of the set of elements in \(K\cap \{m,m+1,\dots,n\}\). The upper asymptotic density of \(K\) is defined by \[\overline{d}(K):= \limsup\frac{K(1,n)}{n},\] and upper uniform density of \(K\) by \[\overline{u}(K):= \limsup\frac{\max\{ K(i+1,i+n)\mid i\geq 0\}}{n}.\] Let \(x=\{x_n\}\) be a sequence of complex numbers. A number \(l\) is called a ``uniform statistical limit point'' of \(x\) if there is a sequence \(\{n_k\}\) such that \(\lim_{k\to \infty} x_{n_k}=l\) and \(\overline{u}(\{n_k\mid k\in\mathbb{N}\})>0\). Replacing upper uniform density by asymptotic density, we obtain a ``statistical limit point'' of \(x\). The paper contains the following results for a bounded sequence \(x\) of complex numbers. \begin{itemize} \item[(1)] Given a nonempty \(F_\sigma\) subset \(M\) of limit points of \(x\), there is a subsequence \(y\) of \(x\) such that \(M\) is the set of all statistical limit points of~\(y\). \item[(2)] Given a nonempty \(F_\sigma\) subset \(M\) of limit points of \(x\), there is a subsequence \(y\) of \(x\) such that \(M\) is the set of all uniform statistical limit points of~\(y\). \item[(3)] Identify the subsequences of \(x\) with the real numbers \(t\in (0,1]\) written in binary expansion with infinitely many ones and denote by \(x(t)\) the subsequence corresponding to \(t\). Then the set of \(t\in(0,1]\) for which the sets of uniform statistical limit points of \(x\) and \(x(t)\) coincide is of Lebesgue measure \(1\) or \(0\) (both cases may occur). \end{itemize}

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Turkey
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Keywords

Summability methods using statistical convergence, subsequences, Contents, measures, outer measures, capacities, uniform statistical convergence, uniform statistical limit points

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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