Pessimistic rough set based decisions: A multigranulation fusion strategy

Multigranulation rough sets (MGRS) is one of desirable directions in rough set theory, in which lower/upper approximations are approximated by granular structures induced by multiple binary relations. It provides a new perspective for decision making analysis based on rough set theory. In decision making analysis, people often adopt the decision strategy "Seeking common ground while eliminating differences" (SCED). This strategy implies that one reserves common decisions while deleting inconsist