Affiliations: [a] College of Applied Mathmatics, Xiamen University of Technology, Xiamen, 361024, PR China. xiawzhang@163.com | [b] College of Science, Jimei University, Xiamen, 361021, PR China. kongqingzhao@163.com
Correspondence:
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Address for correspondence: College of Science, Jimei University, Xiamen, 361021, PR China.
Abstract: The generalization of Pawlak rough sets is one of the most important directions of rough set theory. In this paper, we propose four types of multi-covering rough set (MCRS) models by combining multi-granulation rough sets with covering rough sets. In the first place, We propose two types of optimistic MCRS models and study their corresponding properties, and then propose another two types of the pessimistic MCRS models and study their corresponding properties as well. Finally, the relationships among the four types of MCRS and the interrelationships between the proposed MCRS models and the existing ones listed in [8] are further investigated.
