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从知识是事物之间的联系的观点出发，提出一种新概念、新集合———相关集合，并进一步定义了相关强度和最相关集合．相关集合是等价关系的推广，它以集合形式说明了给定论域中部分元素同另一部分元素存在的对应关系；相关强度表示了给定集合之间的接近程度；最相关集合表达了给定概念集合之间的某种对应关系．它们可以用来化简知识库系统、表示结构化知识及研究传统关系的各种性质．文中给出了它们的定义和具体应用实例．
From the point of view that knowledge is the connection between things, we propose a new concept, a new set --- the related set, and further define the correlation strength and the most relevant set. Relevant sets are generalizations of equivalence relations, which describe the correspondence between some elements in a given discourse and the other elements in a set form. Relevant intensities indicate the closeness between given sets. The most relevant sets express given Some correspondence between concept sets. They can be used to streamline knowledge base systems, to represent structured knowledge, and to study various properties of traditional relationships. The paper gives their definition and application examples.