The three-dimensional fuzzy sets and their cut sets

  • Authors:

  • Xiao-shen Li;Xue-hai Yuan;E. Stanley Lee

  • Affiliations:

  • Department of Applied Mathematics, Dalian University of Technology, Dalian 116024, PR China;School of Electronic and Information Engineering, Dalian University of Technology, Dalian 116024, PR China;Department of Industrial and Manufacturing Systems Engineering, Kansas State University, Manhattan, KS66506, USA

  • Venue:
  • Computers & Mathematics with Applications
  • Year:
  • 2009

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Abstract

In this paper, a new kind of L-fuzzy set is introduced which is called the three-dimensional fuzzy set. We first put forward four kinds of cut sets on the three-dimensional fuzzy sets which are defined by the 4-valued fuzzy sets. Then, the definitions of 4-valued order nested sets and 4-valued inverse order nested sets are given. Based on them, the decomposition theorems and representation theorems are obtained. Furthermore, the left interval-valued intuitionistic fuzzy sets and the right interval-valued intuitionistic fuzzy sets are introduced. We show that the lattices constructed by these two special L-fuzzy sets are not equivalent to sublattices of lattice constructed by the interval-valued intuitionistic fuzzy sets. Finally, we show that the three-dimensional fuzzy set is equivalent to the left interval-valued intuitionistic fuzzy set or the right interval-valued intuitionistic fuzzy set.