rough approximation operator 粗糙近似算子
Weak approximation operator 弱逼近算子
Linear approximation operator 线性逼近算子
best co-approximation operator 最佳共逼近算子
fuzzy rough approximation operator 模糊粗糙近似算子
approximation by operator [数] 算子逼近
In the end , we compare the different definitions of the lower approximation operator on the approximation space, and point out the research directions.
最后是结束语，对模糊近似空间上的下近似算子进行了比较，并指出了以后的研究方向。
参考来源 - 模糊近似空间上模糊集的粗糙集及其粗糙度A novel concept of similarity approximation operator is proposed, and the properties of the approximation operators are discussed. The aximatic characterization of this operator is then examined.
定义了类近似算子,讨论近似算子的性质,并给出它们的公理刻画。
参考来源 - 基于关系的概念格属性约简及集合近似·2,447,543篇论文数据，部分数据来源于NoteExpress
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