The fuzzy membership representations of rough sets and its interrelations
Sun Bing-zhen, Zengtai Gong · Journal of Northwest Normal University · 2006
The rough membership function based on the approximation precision ρ__R(X) is defined by the approximation precision of the any rough set on the universe.It can describe the elements in the boundary region of rough sets more precisionly.Meanwhile,the essence of rough sets is presented by the membership function of fuzzy sets.