Fuzziness of covering based generalized rough sets
Guoyin Wang · Journal of Chongqing University of Posts and Telecommunications · 2009
The uncertainty measure for rough sets is one of the key problems in rough set theory.Rough membership function provides a new interpretation and a new uncertainty measure for rough sets.Tsang has made a reseach on the approximate operator in covering approximation space,and proposed a more reasonable covering rough set model.However,the uncertainty measure of this rough set has never been studied.Focusing on the third type of covering based generalized rough sets,the rough membership function of the third type of covering based generalized rough sets was defined,and hereby its fuzziness was defined based on the proposed rough membership function.