arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1905.00514math.FAmath.GN
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理想核心的特征

Characterizations of the Ideal Core

Paolo Leonetti

摘要:

给定$ω$上的理想$\mathcal{I}$和拓扑向量空间中的序列$x$,设$x$的$\mathcal{I}$ -核是包含所有$I \in \mathcal{I}$的$\{x_n: n \notin I\}$的最小闭凸集.我们展示了$\mathcal{I}$ -核心的两个特征。这意味着在$\mathbf{R}^k$中有界序列的$\mathcal{I}$ -核心仅仅是其$\mathcal{I}$ -簇点的凸包。作为应用,我们在二重序列的Pringsheim-收敛和$e$ -收敛的背景下简化和推广了几个结果.

英文摘要:

Given an ideal $\mathcal{I}$ on $ω$ and a sequence $x$ in a topological vector space, we let the $\mathcal{I}$-core of $x$ be the least closed convex set containing $\{x_n: n \notin I\}$ for all $I \in \mathcal{I}$. We show two characterizations of the $\mathcal{I}$-core. This implies that the $\mathcal{I}$-core of a bounded sequence in $\mathbf{R}^k$ is simply the convex hull of its $\mathcal{I}$-cluster points. As applications, we simplify and extend several results in the context of Pringsheim-convergence and $e$-convergence of double sequences.

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