THE WEAK URYSOHN NUMBER AND UPPER BOUNDS FOR CARDINALITY OF HAUSDORFF SPACES

被引：0
|
作者：
Diaz Reyes, Jesus [1 ]
Romero Morales, Armando [2 ]
机构：
[1] Benemerita Univ Autonoma Puebla, Fac Ciencias Fis Matemat, Puebla 72570, Mexico
[2] Univ Tecnol Mixteca, Inst Fis & Matemat, Km 2-5 Carretera Acatlima, Huajuapan De Leon, Oaxaca, Mexico
来源：
HOUSTON JOURNAL OF MATHEMATICS | 2018年 / 44卷 / 04期
关键词：
Weak Urysohn number; cardinal functions; cardinal inequalities; elementary submodel;
D O I：
暂无
中图分类号：
O1 [数学];
学科分类号：
0701 ; 070101 ;
摘要：
In this article, following the line of research of Bonanzinga [5], we introduce a new cardinal function, the weak Urysohn number of a space X, U*(X), to extend some famous inequalities due to Bella-Cammaroto [4] and Alas [1] among others, from the class of Urysohn spaces to the class of Hausdorff spaces with U*(X) <= omega.
引用
收藏
页码：1389 / 1398
页数：10
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