文章基本信息

标题：On Covering Approximation Subspaces
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作者：Xun Ge
期刊名称：Computer Science Journal of Moldova
印刷版ISSN：1561-4042
出版年度：2009
卷号：17
期号：1
页码：74-88
出版社：Institute of Mathematics and Computer Science
摘要：Let ( U' ; C' ) be a subspace of a covering approximation space ( U ; C ) and X⊂U' . In this paper, we show that and B'(X)⊂B(X)∩U' . Also, iff ( U ; C ) has Property Multiplication. Furthermore, some connections between outer (resp. inner) definable subsets in ( U ; C ) and outer (resp. inner) definable subsets in ( U' ; C' ) are established. These results answer a question on covering approximation subspace posed by J. Li, and are helpful to obtain further applications of Pawlak rough set theory in pattern recognition and artificial intelligence.
关键词：Rough set; covering approximation subspace; covering approximation operator; definable; outer definable; inner definable