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On the Alster, Menger and D-type covering properties
Quaestiones Mathematicae ( IF 0.6 ) Pub Date : 2019-11-28 , DOI: 10.2989/16073606.2019.1692951 Alexander V. Osipov 1 , Selma Özçağ 2
中文翻译:
关于Alster,Menger和D型覆盖属性
更新日期:2019-11-28
Quaestiones Mathematicae ( IF 0.6 ) Pub Date : 2019-11-28 , DOI: 10.2989/16073606.2019.1692951 Alexander V. Osipov 1 , Selma Özçağ 2
Affiliation
Abstract
In this paper we give new characterizations for almost Menger and weakly Menger spaces by neighborhood assignments and define a natural weakening of almost D-spaces and weakly D-spaces. We discuss the relationships among the properties “D-type”, “Menger”, “Alster”, and the weak versions of these properties in Lindelöf spaces.
中文翻译:
关于Alster,Menger和D型覆盖属性
摘要
在本文中,我们通过邻域分配为几乎Menger和弱Menger空间提供了新的刻画,并定义了几乎D空间和弱D空间的自然弱化。我们讨论了属性“ D型”,“门格”,“阿尔斯特”以及Lindelöf空间中这些属性的弱形式之间的关系。