Abstract
Rough set theory, proposed by Pawlak in 1982, has been conceived as an important mathematical tool to conceptualize and analyze different types of data. It is an extension of classical set theory for the research of systems marked by uncertain and incomplete information. In the paper, by using tolerance relation in original VPRS model proposed by Ziarko, a novel model of VPRS is proposed in set-valued information systems. The related important properties are also investigated.
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