By extending the crisp set X to the fuzzy set F, Dubois and Prade defined the notion of rough fuzzy sets (a special case of fuzzy rough sets), and fuzzy rough sets with respect to the fuzzy relation R.
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- 通過(guò)將近似對象由經(jīng)典集合X推廣到模糊集合F,Dubois和Prade定義了粗糙模糊集的概念(模糊粗糙集的一個(gè)特殊情形),又引入模糊關(guān)系R得到模糊粗糙集的概念。
