The Roughness Measures of the Fuzzy Rough Sets
模糊关系下的粗集粗糙度

In this paper, the orughness measures of rough sets is studied. Firstly, the roughness mesures of Pawlak rough sets is analysized in detail,and a inclusion-exclusion principle on rough sets is obtained. We also extend these results to fuzzy rough sets,which is some significance for deeply study of fuzzy rough sets theory.