对推广于双论域的粗糙集进行了更进一步的研究,提出了独立集的概念,以独立集为基础讨论了双论域上粗糙集的模型及其性质,并对引入独立集的粗糙集理论的实际应用进行了分析.
Based on a new concept of solitary sets, the paper presents the structures of the lower and upper approxi- mations and discusses properties on double universes . For solitary set has its sepecial meaning in application of rough sets on double universes , we can see solitary set is useful for rough set theory.