超α-可数紧空间的若干性质

该文在超拓扑空间上对超α-可数紧性质进行了研究,给出了超α-可数紧、几乎超α-可数紧及弱超α-可数紧的定义,研究了这些超拓扑性质之间的关系,探究了它们闭子集的超拓扑性质及它们在超α-连续映射下像的性质。T.M.Al-shami在文献中利用超开集定义了超紧和超lindel?f、几乎超紧和几乎超lindel?f、弱超紧和弱超lindel?f等空间,研究了它们之间的对应关系。

几乎超b-可数紧空间的若干性质研究

在超可数紧空间和超b-可数紧空间的基础上,阐述推广空间—几乎超b-可数紧空间的遗传性和映射性质.得出了任意的超b-可数紧空间必为几乎超b-可数紧空间,几乎超b-可数紧空间中的超-闭开集是几乎超b-可数紧的,几乎超b-可数紧空间在超-连续映射下的像是几乎超可数紧的等结果.。

Almost Second Countable Spaces, Almost First Countable Spaces and Almost Separable Spaces

In this paper, we introduce almost second countable spaces, almost first countable spaces and almost separable spaces which are generalisations of second countable, first countable and separable spaces, respectively. We also study the prop-erties of the three new classes of spaces and almost Lindelof spaces and improve some results in [2].