Stratified Rough Sets and Granular Computing
نویسنده
چکیده
This paper examines granulation structures for stratified rough set approximations. With respect to different level of granulations, various approximations are obtained. Two special types of granulation structures are investigated. A nested sequence of granulations by equivalence relations leads to a nested sequence of rough set approximations. A hierarchical granulation, characterized by a special class of equivalence relations, leads to a more general approximation structure.
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