More on ideal limit points

被引：0
|
作者：
He, Xi [1 ]
Zhang, Hang [2 ]
Zhang, Shuguo [3 ]
机构：
[1] Nanyang Inst Technol, Sch Math & Sci, 80 Changjiang Rd, Nanyang 473004, Peoples R China
[2] Southwest Jiaotong Univ, Sch Math, Xipu Campus,West Pk, Chengdu 610756, Peoples R China
[3] Sichuan Univ, Coll Math, 24 South Sect 1,Yihuan Rd, Chengdu 610065, Peoples R China
来源：
TOPOLOGY AND ITS APPLICATIONS | 2022年 / 322卷
关键词：
Ideal limit points; Ideal cluster points; P plus; WeaklyP plus;
D O I：
10.1016/j.topol.2022.108324
中图分类号：
O29 [应用数学];
学科分类号：
070104 ;
摘要：
In this paper we continue the study of ideal limit points. We introduce a new combinatorial property of ideals called weakly P+, and investigate the relation between P+, weakly P+ and the complexity of ideal limit points. Moreover, we clarify the relation between ideal limit points, ideal cluster points and ordinary ideal limit points. Finally, we investigate the projective hierarchy of ideal limit points. (c) 2022 Elsevier B.V. All rights reserved.
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页数：9
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