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arXiv 0811.4144math.GN
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瓦尔迪维亚紧凑型线的结构

The structure of Valdivia compact lines

Ondrej Kalenda, Wieslaw Kubis

摘要:

研究线性序空间在序拓扑上是Valdivia紧的。我们发现这些空间的内部特征,我们提出了一个反例反驳了第一作者早先提出的猜想。该猜想断言:一条紧直线是Valdivia紧的,如果它的权不超过aleph 1,每一个不可数特征点从一侧孤立,且每一个闭的第一可数子空间是可度量化的。事实证明,最后一个条件是不够的。另一方面,我们证明了猜想是有效的,如果不可数字符的点集的封闭是分散的。这改进了第一作者的一个较早的结果。

英文摘要:

We study linearly ordered spaces which are Valdivia compact in their order topology. We find an internal characterization of these spaces and we present a counter-example disproving a conjecture posed earlier by the first author. The conjecture asserted that a compact line is Valdivia compact if its weight does not exceed aleph one, every point of uncountable character is isolated from one side and every closed first countable subspace is metrizable. It turns out that the last condition is not sufficient. On the other hand, we show that the conjecture is valid if the closure of the set of points of uncountable character is scattered. This improves an earlier result of the first author.

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