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Duality between Measure and Category of Almost All Subsequences of a Given Sequence. (arXiv:1711.04265v3 [math.FA] UPDATED)
来源于:arXiv
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. 查看全文>>