In this paper, six types of optimistic multi-covering rough set models and six types of pessimistic multi-covering rough set models are proposed in multi-covering approximation space. From three different points of views, relationships among multi-...
In view of granular computing, the classical optimistic and pessimistic multigranulation rough set models are both primarily based on simple granules among multiple granular structures, namely multiple partitions of the universe in MGRS. This ...
The original rough set model, i.e., Pawlak's single-granulation rough set model has been extended to a multigranulation rough set model, where two kinds of multigranulation approximations, i.e., the optimistic and pessimistic approximations were ...
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