Type 2 fuzzy sets: an appraisal of theory and applications
International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems
Algebraic Structures of Truth Values in Fuzzy Logic
IJCAI '91 Proceedings of the Workshops on Fuzzy Logic and Fuzzy Control
ISMVL '00 Proceedings of the 30th IEEE International Symposium on Multiple-Valued Logic
de Morgan Bisemilattice of Fuzzy Truth Value
ISMVL '02 Proceedings of the 32nd International Symposium on Multiple-Valued Logic
A First Course in Fuzzy Logic, Third Edition
A First Course in Fuzzy Logic, Third Edition
International Journal of Approximate Reasoning
IEEE Transactions on Fuzzy Systems
On type-2 fuzzy sets and their t-norm operations
Information Sciences: an International Journal
On type-2 fuzzy relations and interval-valued type-2 fuzzy sets
Fuzzy Sets and Systems
Type-2 operations on finite chains
Fuzzy Sets and Systems
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This paper addresses some questions about the variety generated by the algebra of truth values of type-2 fuzzy sets. Its principal result is that this variety is generated by a finite algebra, and in particular is locally finite. This provides an algorithm for determining when an equation holds in this variety. It also sheds light on the question of determining an equational axiomatization of this variety, although this problem remains open.