Regard as a new soft compute,the study of rough-sets theory is lift in the world. The rough sets model is popularized from respeet of universes. The concepts, qualitities and attribute reduction about rough sets on N- Universe are given.
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何薇薇. 多论域粗糙集模型及其应用[J]. 科学技术与工程, 2006, (19): 3013-3016. HE Weiwei. Model and Application of Rough Sets on Multi-universes[J]. Science Technology and Engineering,2006,(19):3013-3016.