Covering Upper Approximations of Rough Sets and Closure Mappings
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Abstract
This paper presents some basic properties of reduction and covering upper approximation of Rough sets. Three kinds of covering
rough set have studied: Semi-reduced, Pointwise-covered and Unary. Some conditions for two covers generating the same covering lower and
upper approximations and relationship between closure mappings and three types of upper covering approximation are identical.
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Keywords: rough set, covering upper approximation, semi-reduced, pointwise-covered, unary, closure mapping
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