Abstract: A new relation is defined in set-valued information system, based on the relation the problem of knowledge reduction in set-valued information system is discussed, the judgment theorems and the discernibility matrices of knowledge reduction are then given in set-valued information system, from which a new approach to knowledge reductions can be provided. The characteristics of different type of attributes in set-valued information system are studied, and the judgment theorems about them are obtained.

Key words: Set-valued information system, Knowledge reduction, Discernibility matrices, Attributes characteristics

摘要： 定义了集值信息系统中的一种新的关系，讨论了在这种关系下集值信息系统的知识约简问题，给出了集值信息系统属性约简的判定定理和辨识矩阵，得到了计算约简的具体方法；讨论了集值信息系统中3种不同类型的属性特征及每一种属性的判定定理。

关键词: 集值信息系统, 知识约简, 可辨识矩阵, 属性特征

CLC Number: 

• TP311