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Approximations in Rough Sets vs Granular Computing for Coverings

Approximations in Rough Sets vs Granular Computing for Coverings
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Author(s): Guilong Liu (Beijing Language and Culture University, China)and William Zhu (University of Electronic Science and Technology of China, China)
Copyright: 2012
Pages: 12
Source title: Developments in Natural Intelligence Research and Knowledge Engineering: Advancing Applications
Source Author(s)/Editor(s): Yingxu Wang (University of Calgary, Canada)
DOI: 10.4018/978-1-4666-1743-8.ch011

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Abstract

Rough set theory is an important technique in knowledge discovery in databases. Classical rough set theory proposed by Pawlak is based on equivalence relations, but many interesting and meaningful extensions have been made based on binary relations and coverings, respectively. This paper makes a comparison between covering rough sets and rough sets based on binary relations. This paper also focuses on the authors’ study of the condition under which the covering rough set can be generated by a binary relation and the binary relation based rough set can be generated by a covering.

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