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arXiv 1310.0678math.GN
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$ω^*\setminus \{x\}$和$S_κ\setminus\{x\}$的Stone-Cech紧化

The Stone-Cech compactifications of $ω^*\setminus \{x\}$ and $S_κ\setminus\{x\}$

Max F. Pitz, Rolf Suabedissen

摘要:

空间$S_κ$是基数$κ$的$κ$饱和布尔代数的Stone空间.它的存在提供了$κ= κ^{<κ}$,并在拓扑上被表征为唯一的$κ$ -Parovichenko空间的重量$κ$。在连续统假设下,$S_{ω_1}$与$ω^*$重合。本文研究了空间$S_κ\setminus \{x\}$的Stone-Cech紧化问题,推广了Fine & Gillman和Comfort & Negrepontis关于空间$ω^*$的相应结果.证明了对$S_κ$的每一点$x$,$S_κ\setminus \{x\}$的Stone-Cech剩余是一个具有基数$2^{2^κ}$的$κ^+$空间,它允许一族$2^κ$不交闭集.作为推论,我们得到$ω^* \setminus \{x\}$的Stone-Cech算子都是同胚的与CH一致.

英文摘要:

The space $S_κ$ is the Stone space of the $κ$-saturated Boolean algebra of cardinality $κ$. It exists provided that $κ= κ^{<κ}$, and is characterised topologically as the unique $κ$-Parovichenko space of weight $κ$. Under the Continuum Hypothesis, $S_{ω_1}$ coincides with $ω^*$. This paper investigates questions related to the Stone-Cech compactification of spaces $S_κ\setminus \{x\}$, extending corresponding results obtained by Fine & Gillman and Comfort & Negrepontis for the space $ω^*$. We show that for every point $x$ of $S_κ$, the Stone-Cech remainder of $S_κ\setminus \{x\}$ is a $κ^+$-Parovichenko space of cardinality $2^{2^κ}$ which admits a family of $2^κ$ disjoint clopen sets. As a corollary we get that it is consistent with CH that the Stone-Cech remainders of $ω^* \setminus \{x\}$ are all homeomorphic.

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