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This paper investigates the deficiency of the accuracy function for interval-valued intuitionistic fuzzy sets (IVIFSs), which was initially proposed by Sahin (Soft Comput 10.1007/s00500-015-1657-x , 2015). And then, two parameters are introduced to characterize the internal mechanism of the accuracy function for the IVIFSs, where the first parameter is the contrast degree between the membership...
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