Topological spaces for fuzzy rough sets determined by fuzzy implication operators

  • Authors:
  • Wei-Zhi Wu;Peirong Lin

  • Affiliations:
  • School of Mathematics, Physics and Information Science, Zhejiang Ocean University, Zhoushan, Zhejiang, P.R. China;Department of Computer Science and Engineering, Zhangzhou Teachers' College, Zhangzhou, Fujian, P.R. China

  • Venue:
  • FSKD'09 Proceedings of the 6th international conference on Fuzzy systems and knowledge discovery - Volume 6
  • Year:
  • 2009

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Abstract

In this paper, a dual pair of lower and upper fuzzy rough approximation operators determined by a fuzzy implication operator are defined and their properties are presented. Topological structures of fuzzy rough sets are then investigated. It is shown that the lower and upper fuzzy rough approximation operators are, respectively, an interior operator and a closure operator in a fuzzy topological space if and only if the fuzzy binary relation is reflexive and transitive.