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Rough Approximations on Preordered Sets

  • Kim, Yong-Chan (Department of Mathematics, Gangneung-Wonju National University) ;
  • Kim, Young-Sun (Department of Applied Mathematics, Pai Chai University)
  • Received : 2011.10.30
  • Accepted : 2011.12.02
  • Published : 2011.12.25

Abstract

In this paper, we investigate the properties of rough approximations defined by preordered sets. We study the relations among the lower and upper rough approximations, closure and interior systems, and closure and interior operators.

Keywords

References

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