The dominance relation is introduced in the double universe information system and some definitions and properties are givenThe attribute reduction and the discernibility matrix are discussed.An example verifies the effectiveness of the method.%在双论域信息系统上引入优势关系,给出了基于优势关系下双论域信息系统上的一些定义及性质,并讨论了双论域信息系统上的属性约简与辩识矩阵,通过实例验证该方法的有效性.
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