科研之友
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摘要
In this paper, we show the following statements: (1) There exists a Tychonoff pseudocompact, star-Hurewicz space having a regular-closed subspace which is not star-Hurewicz; (2) Assuming omega(1) < b, there exists a Tychonoff strongly star-Hurewicz (hence star-Hurewicz) space having a regular-closed G(delta)-subspace which is not star-Hurewicz (hence not strongly star-Hurewicz); (3) An open F-sigma-subset of a strongly star-Hurewicz space is strongly star-Hurewicz.
- 出版日期2013
- 单位南京师范大学; 上海金融学院
