...
首页> 外文期刊>Topology and its applications >Selective separability and its variations
【24h】

Selective separability and its variations

机译:选择性可分离性及其变化

获取原文
获取原文并翻译 | 示例
           

摘要

A space X is said to be selectively separable (= M-separable) if for each sequence {D_n: n ∈ω} of dense subsets of X, there are finite sets F_n ⊂ D_n {n ∈ω) such that U{F_n: n ∈ ω} is dense in X. On selective separability and its variations, we show the following: (1) Selective separability, R-separability and C/V-separability are preserved under finite unions; (2) Assuming CH (the continuum hypothesis), there is a countable regular maximal R-separable space X such that X2 is not selectively separable; (3) {0, l}~c has a selectively separable, countable and dense subset 5 such that the group generated by S is not selectively separable. These answer some questions posed in Bella et al. (2008) [7].
机译:如果对于X的密集子集的每个序列{D_n:n∈ω}有有限集合F_n⊂D_n {n∈ω)使得U {F_n: n∈ω}在X中是稠密的。关于选择性可分离性及其变化,我们显示以下内容:(1)选择性可分离性,R可分离性和C / V可分离性在有限联合下得以保留; (2)假设CH(连续性假设),存在可计数的规则最大R可分离空间X,使得X2无法选择性分离; (3){0,1}〜c具有可选择性地分离,可数且密集的子集5,使得由S产生的基团不可被选择性地分离。这些回答了贝拉等人提出的一些问题。 (2008)[7]。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号