【摘要】 论文从拓扑学角度研究覆盖近似空间(U,C),提出了加细覆盖的概念,讨论了加细覆盖近似空间的约简问题;同时给出了对定义在加细覆盖近似空间上的模糊集进行上、下近似计算的一种计算方法,并讨论该算法的一些性质。更多还原

【Abstract】 In this paper,from the point of topological view,subsets of covering approximation space(U,C) are studied in deep.And the concept of fine covering is presented,topological structure and miminum reduction of fine covering approximation space are studied.A algorithm for upper-and-low approximation sets of a fuzzy set defined on the refined covering approximation space are presented,some properties of the algorithm are also examined.更多还原