
handle: 11552/8943
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}
Summability methods using statistical convergence, subsequences, Contents, measures, outer measures, capacities, uniform statistical convergence, uniform statistical limit points
Summability methods using statistical convergence, subsequences, Contents, measures, outer measures, capacities, uniform statistical convergence, uniform statistical limit points
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