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The description of an information system will be more accurate when objects and attributes are added to it. The approximations of a concept may change when an information system varies. No research work has been done yet on incremental updating for approximations when objects and attributes change simultaneously. In traditional rough set theory, granules are induced by equivalence classes. The granularity...
Set-valued information systems are a general model of single-valued information systems. Set-valued ordered information systems can be defined based on the inclusion relation between attribute values of objects. Firstly, a variable precision set-valued ordered rough set model is proposed in this paper by introducing the variable precision rough set method into set-valued ordered information systems...
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