Product Approximation of Grade and Precision  

作　　者：张贤勇 莫智文 

机构地区：[1]Section of Fundamental Studies, Sichuan Normal University Chengdu 610068 China

出　　处：《Journal of Electronic Science and Technology of China》2005年第3期276-279,283,共5页中国电子科技（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No. 69803007)

摘　　要：The normal graded approximation and variable precision approximation are defined in approximate space. The relationship between graded approximation and variable precision approximation is studied, and an important formula of conversion between them is achieved The product approximation of grade and precision is defined and its basic properties are studied.The normal graded approximation and variable precision approximation are defined in approximate space. The relationship between graded approximation and variable precision approximation is studied, and an important formula of conversion between them is achieved The product approximation of grade and precision is defined and its basic properties are studied.

关 键 词：rough sets approximation operators operators of approximations graded rough sets variable precision rough sets 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程]