Relational Interpretations of Neigborhood Operators and Rough Set Approximation Operators

@article{Yao1998RelationalIO,
  title={Relational Interpretations of Neigborhood Operators and Rough Set Approximation Operators},
  author={Yiyu Yao},
  journal={Inf. Sci.},
  year={1998},
  volume={111},
  pages={239-259}
}
This paper presents a framework for the formulation, interpretation, and comparison of neighborhood systems and rough set approximations using the more familiar notion of binary relations. A special class of neighborhood systems, called 1-neighborhood systems, is introduced. Three extensions of Pawlak approximation operators are analyzed. Properties of neighborhood and approximation operators are studied, and their connections are examined. 
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