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

页码：1389 / 1398

页数：10

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