Fuzzy Sets and Systems
Value approximation of fuzzy systems variables
Fuzzy Sets and Systems
Fuzzy complex analysis I: differentiation
Fuzzy Sets and Systems
Fuzzy continuous function and its properties
Fuzzy Sets and Systems
Fuzzy limit theory of fuzzy complex numbers
Fuzzy Sets and Systems
Fuzzy complex analysis II: integration
Fuzzy Sets and Systems
A note on the value similarity of fuzzy systems variables
Fuzzy Sets and Systems
Fuzzy Sets and Systems
On improving trapezoidal and triangular approximations of fuzzy numbers
International Journal of Approximate Reasoning
New geometric inference techniques for type-2 fuzzy sets
International Journal of Approximate Reasoning
Piecewise parametric polynomial fuzzy sets
International Journal of Approximate Reasoning
Robustness of fuzzy reasoning and δ-equalities of fuzzy sets
IEEE Transactions on Fuzzy Systems
IEEE Transactions on Fuzzy Systems
IEEE Transactions on Fuzzy Systems
Robustness analysis of full implication inference method
International Journal of Approximate Reasoning
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A complex fuzzy set is a fuzzy set whose membership function takes values in the unit circle in the complex plane. This paper investigates various operation properties and proposes a distance measure for complex fuzzy sets. The distance of two complex fuzzy sets measures the difference between the grades of two complex fuzzy sets as well as that between the phases of the two complex fuzzy sets. This distance measure is then used to define @d-equalities of complex fuzzy sets which coincide with those of fuzzy sets already defined in the literature if complex fuzzy sets reduce to real-valued fuzzy sets. Two complex fuzzy sets are said to be @d-equal if the distance between them is less than 1-@d. This paper shows how various operations between complex fuzzy sets affect given @d-equalities of complex fuzzy sets. An example application of signal detection demonstrates the utility of the concept of @d-equalities of complex fuzzy sets in practice.