Information Technology Journal1812-56381812-5646Asian Network for Scientific Information10.3923/itj.2014.1396.1400LiuCaihui 72014137Recently, much attention has been paid on Multi-granulation
Rough Set (MGRS) and MGRS has been a promising topic in rough set theory. This
study firstly proposes two kinds of covering multi-granulation rough set, namely,
optimistic covering multi-granulation rough set and pessimistic covering multi-granulation
rough set, on the basis of the maximal descriptors of elements in a given covering
approximation space. And then, a number of basic properties of the two kinds
of rough sets are discussed. Finally, the relationships among the models are
disclosed.]]>Lin, G.P., Y.H. Qian and J.J. Li,20112011pp: 673680Lin, G., Y. Qian and J. Li,20125310801093Liu, C. and D. Miao,20112011pp: 8790Liu, C. and M. Wang,20112011pp: 146149Qian, Y., J. Liang, Y. Yao and C. Dang,2010180949970Qian, Y., J. Liang and C. Dang,201020420430She, Y. and X. He,2012368192Xu, W., Q. Wang and X. Zhang,20112011pp: 357364Xu, W., W. Sun, X. Zhang and W. Zhang,201241475501Yang, X.B., X.N. Song, Z.H. Chen and J.Y. Yang,20113223232Yang, X.B., X.N. Song, H.L. Dou and J.Y. Yang,201115570Yang, X.B., Y.H. Qian and J.Y. Yang,20122711691183Yao, Y. and B. Yao,201220091107Zhou, Z.G.,2012281013