On multigranulation rough sets in incomplete information system

作者: Xibei Yang , Xiaoning Song , Zehua Chen , Jingyu Yang

DOI: 10.1007/S13042-011-0054-8

关键词:

摘要: Multigranulation rough set is a new and interesting topic in the theory of set. In this paper, multigranulation sets approach introduced into incomplete information system. The tolerance relation, similarity relation limited relations are employed to construct optimistic pessimistic sets, respectively. Not only properties about these discussed, but also relationships among models explored. It shown that by theory, based lower approximations fall between approximations, upper approximations. Such results consistent those single-granulation models.

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