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Journal of Mathematics and Informatics
The Zoom-in and Zoom-out operators play an important role in the model of Granular Computing based on covering. In this paper, a new Zoom-in operator is defined, the combination operators formed by the Zoom-in and Zoom-out operators on the (granulated) universe of discourse are presented, and their relationships to covering rough set, topological space and Galois connection are discussed. In particular, it is proved that a pair of approximation operators on the universe of discourse obtained byfatcat:ctk5atni3na7havwfkewasvppy