L R S理论中定义了粗糙隶属函数（rough membership function）。通过使用不可分辨 关系，定义元素a对集合x的粗糙隶属函数如下： 显然O、，。
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首先本文将粗糙集理论与模糊集理论进行比较，通过粗糙隶属函数将模糊集的研究方法引入到粗糙集的研究中。
In this paper, firstly we compare RST with fuzzy Sets Theory and introduce fuzzy method into the study of RST by the rough membership function.
提出应用粗糙集理论辩识模糊隶属函数的可行性。
The feasibility of applying theory of rough sets to the identification of fuzzy membership function is confirmed in this paper.
通过粗糙隶属度函数，将粗集理论与模糊理论联系起来，建立一种粗集理论与模糊理论的关系。
In this paper, we combine the fuzzy set theory with rough set theory by rough membership function and establish a relation between them.
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