Notes on remainders of topological spaces in some compactifications
Notes on remainders of topological spaces in some compactifications
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关于某些紧化中拓扑空间的剩余部分的注释
DOI:
10.1016/j.topol.2016.05.009
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发表时间:
2016-08
期刊:
影响因子:
--
通讯作者:
Wei He
中科院分区:
文献类型:
--
作者:
Hanfeng Wang;Wei He
In this paper, we investigate the compactifications of some topological spaces such that their remainders have countable tightness. We also study addition theorems for compacta. The main results are:(1) If bX is a compactification of a first-countable space X with a G δ-diagonal (or a space X with a point-countable base) and b X∖ X has countable tightness, then both bX and b X∖ X have countable fan-tightness;(2) If a non-locally compact paratopological group G has a compactification bG such that the remainder b G∖ G is the union of a finite family of metrizable subspaces, then G is locally separable and locally metrizable;(3) If a compact Hausdorff space Z= X∪ Y, where X is a non-locally compact topological group which is a σ-space and dense in Z, and Y is a semitopological group, then Z is separable and metrizable;(4) If a compact Hausdorff space Z= X∪ Y, where X is a non-locally compact paratopological group that has a countable network and is dense in Z, and Y is a semitopological group, then Z is separable and metrizable. Among them (2) and (3) improve the corresponding results given by AV Arhangel'skii in [7].
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影响因子:
0.6
作者:
A. Arhangel'skii;J. Mill
通讯作者:
A. Arhangel'skii;J. Mill
影响因子:
0.6
作者:
A. Arhangel'skii
通讯作者:
A. Arhangel'skii
DOI:
--
发表时间:
1996
期刊:
--
影响因子:
--
作者:
A. Arhangel'skii;A. Bella
通讯作者:
A. Arhangel'skii;A. Bella
影响因子:
0.6
作者:
A. Arhangel'skii
通讯作者:
A. Arhangel'skii
DOI:
--
发表时间:
2005
期刊:
--
影响因子:
--
作者:
J. Gerlits;I. Juhász;Z. Szentmiklóssy
通讯作者:
J. Gerlits;I. Juhász;Z. Szentmiklóssy