Rough Set Approximations and Information Granules
粗糙集近似与信息粒度

In this paper,we prove that basic information granules in Pawlak information systems,incomplete information systems,and incomplete fuzzy information systems can be respectively described as three types of rough set approximations. By using the upper approximations of attribute value of an object with respect to the object-attribute approximation space,we can obtain an object set in which all the objects have the same or similar information,that is,we can transform the object-attribute value into basic infor...