中文说明：调近似表示空间的概念,指出了各种不同的信息系统均可以转化为协调近似表示空间.同时,在协调近似表示空间上,给出了属性协调集的判定定理以及属性约简方法,给出了三类不同属性(核心、相对必要属性、不必要属性)的特征定理.
English Description：
It is pointed out that all kinds of information systems can be transformed into compatible approximate representation space. At the same time, on the compatible approximate representation space, the judgment theorem of attribute consistent set and attribute reduction method are given, and the Characteristic Theorems of three kinds of different attributes (core, relative necessary attribute and unnecessary attribute) are given