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arXiv 1807.00845math.LO
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$σ$ -紧集生成的理想中的$G_δ$集

$G_δ$ sets in $σ$-ideals generated by compact sets

Maya Saran

摘要:

给定一个紧波兰空间$E$及其紧子集$\mathcal{K}(E)$的超空间,我们考虑$G_δ$类$σ$ -$E$的紧子集的理想可以通过$\mathcal{K}(E)$的紧子集来表示.如果我们扩展这样一个理想的$I$考虑$G_δ$(或分析)集所涵盖的可数工会的集合在$I$,我们表明,扩展的集合仍然可以表示通过一些紧凑的子集的$\mathcal{K}(E)$。

英文摘要:

Given a compact Polish space $E$ and the hyperspace of its compact subsets $\mathcal{K}(E)$, we consider the class of $G_δ$ $σ$-ideals of compact subsets of $E$ that can be represented via a compact subset of $\mathcal{K}(E)$. If we extend such an ideal $I$ by considering $G_δ$ (or analytic) sets that are covered by countable unions of sets in $I$, we show that the extended collection can still be represented via some compact subset of $\mathcal{K}(E)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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