变精度覆盖近似算子与覆盖近似算子的关系

摘要

变精度覆盖粗糙集模型是在放宽了覆盖标准的前提下给出的,因而导致近似算子发生了变化,但其变化有一定的规律.在介绍了覆盖粗糙集模型和变精度覆盖粗糙集模型的概念的基础上,给出并证明了变精度覆盖粗糙近似算子与覆盖粗糙近似算子之间的关系,即定理1、定理2及其推论.%The model of variable precision coverage rough set was proposed under certain conditions of relaxing coverage standard which yields diversification of the approximation operators, and the change is in certain laws in addition. Af-ter introducing the concepts on models of coverage rough set and also of variable precision coverage rough set, we proved the relationships of approximation operators between them. That is,we achieved the results in theorem 1, theorem 2 and related corollaries.