期刊名称：International Journal of Mathematics and Mathematical Sciences
印刷版ISSN：0161-1712
电子版ISSN：1687-0425
出版年度：2006
卷号：2006
DOI：10.1155/IJMMS/2006/18647
出版社：Hindawi Publishing Corporation
摘要：Some properties of minimal closed sets and maximal closed sets are
obtained, which are dual concepts of maximal open sets and minimal open sets, respectively. Common properties of minimal closed sets and minimal open sets are
clarified; similarly, common properties of maximal closed sets and maximal
open sets are obtained. Moreover, interrelations of these four concepts are
studied.
