| 1. | 4 hu x , cercone n . learning in relational databases : a rough set approach . international journal of computational intelligence , 1995 , 11 : 323 - 338 . 5 miao d , wang j . information - based algorithm for reduction of knowledge 为解决这一问题, 8引入了属性序这一概念,用于描述用户需求,以及在此基础上给出基于差别矩阵计算reduct的完备算法差别矩阵属性序算法。 |