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arxiv: 1711.04265 · v3 · pith:MPYDW6K2new · submitted 2017-11-12 · 🧮 math.FA · math.GN· math.PR

Duality between Measure and Category of Almost All Subsequences of a Given Sequence

classification 🧮 math.FA math.GNmath.PR
keywords measurecategoryclustergivenpointsequencestatisticalsubsequences
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Let $S$ be the set of subsequences $(x_{n_k})$ of a given real sequence $(x_n)$ which preserve the set of statistical cluster points. It has been recently shown that $S$ is a set of full (Lebesgue) measure. Here, on the other hand, we prove that $S$ is meager if and only if there exists an ordinary limit point of $(x_n)$ which is not a statistical cluster point of $(x_n)$. This provides a non-analogue between measure and category.

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