Universal elements for some classes of spaces

被引:0
|
作者
Georgiou, D. N. [1 ]
Iliadis, S. D. [1 ]
Megaritis, A. C. [1 ]
机构
[1] Univ Patras, Dept Math, Patras 26504, Greece
来源
APPLIED GENERAL TOPOLOGY | 2011年 / 12卷 / 02期
关键词
Dimension-like function; saturated class; universal space;
D O I
暂无
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
In the paper [4] two dimensions, denoted by dm and Dm, are defined in the class of all fla,usdorff spaces. The dimension Din does not have the universality property in the class of separable metrizable spaces because the family of all such spaces X with Dm (X) <= 0 coincides with the family of all totally disconnected spaces in which there are no universal (see [5]). In [3] elements (see 1 we gave the dimension-like functions dm(E)(K,B) and Dm(E)(K,B), where IK is a class of subsets, lE a class of spaces and 1B a class of bases and we proved that in the families IP(dm(E)(K,B) < kappa) and P(Dm(E)(K,B) <= kappa) of all spaces X for which dm(E)(K,B)(X) < kappa and Dm(E)(K,B)(X) <= kappa, respectively there exist universal elements. In this paper, we give some new dimension-like functions and define using these definitions classes of spaces in which there arc universal elements.
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页码:193 / 211
页数:19
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