Abstract
Some commonly accepted statements concerning the basic fuzzy logicproposed by Lotfi Zadeh in 1965, have led to suggestions that fuzzy logicis not a logic in the same sense as classical bivalent logic. Thoseconsidered herein are: fuzzy logic generates results that contradictclassical logic, fuzzy logic collapses to classical logic, there can be no prooftheory for fuzzy logic, fuzzy logic is inconsistent, fuzzy logic producesresults that no human can accept, fuzzy logic is not proof-theoreticcomplete, fuzzy logic is too complex for practical use, and, finally, fuzzylogic is not needed. It is either proved or argued herein that all of the thesestatements are false and are, hence, misconceptions. A fuzzy logic withtruth values specified as subintervals of the real unit interval [0.0, 1.0] isintroduced. Proofs of the correctness, consistency, and proof theoreticcompleteness of the truth interval fuzzy logic are either summarized orcited. It is concluded that fuzzy logics deserve the accolade of logic tothe same degree that the term applies to classical logics.
Similar content being viewed by others
References
Chang, C. L. (1997). Fuzzy-Logic-Based Programming. World Scientific, NJ.
Cleave, J. P. (1991). A Study of Logics. Oxford University Press, New York, NY.
Cox, E. (1994). The Fuzzy Systems Handbook. Academic Press, Cambridge, MA.
Cranford, R. & Smith, D. (1987). Consciousness: The Most Critical Moral (Constitutional) Standard for Human Personhood. American Journal of Law and Medicine 13: 233–248. IEEE Expert 9(4): 14.
Elfrink, B. & Reichgelt, H. (1989). Assertion-Time Inference in Logic-Based Systems. In Jackson, P., Reichgelt, H. and Harmelen, F. (eds.) Logic-Based Knowledge Representation, 115–116. The MIT Press, Cambridge, MA.
Elkan, C. (1993). The Paradoxical Success of Fuzzy Logic. In Proceedings of the Eleventh National Conference on Artificial Intelligence, 698-703. MIT Press.
Elkan, C. (1994). The Paradoxical Success of Fuzzy Logic. IEEE Expert 9(4): 3–8.
Entemann, C. (2000). A Fuzzy Logic with Interval Truth Values. The International Journal of Fuzzy Sets and Systems 113(2): 161–183.
Entemann, C. (2001). A Fuzzy Logic Controller for a Small Autonomous Mobile Robot. In Proceedings of the IASTED International Conference on Artificial Intelligence and Soft Computing, 99-104. ACTA Press.
Haack, S. (1996). Deviant Logic, Fuzzy Logic. University of Chicago Press, Chicago, IL.
Kenevan, J. & Neapolitan, R. (1982). A model theoretic approach to propositional fuzzy logic using Beth Tableaux. In Zadeh, L. and Kacprzyk, J. (eds.) Fuzzy Logic for theManagement of Uncertainty, 141–157. John Wiley & Sons, Inc., New York, NY.
Konieki, J. (1991). Editor's Mailbox. AI Expert, May 9.
McNeil, D. & Freiberger, P. (1993). Fuzzy Logic. NY: Simon & Schuster, New York.
Pelletier, F. J. (1994). Fuzzy Logic, A Misplaced Appeal. IEEE Expert 9(4): 29–31.
Wikler, D. (1988). Not Dead, Not Dying? Ethical Categories and persistent vegetative state. Hastings Center Report: 41-47.
Zadeh, L. (1965). Fuzzy Sets. Information and Control 8(5): 338–353.
Zadeh, L. (1988). Dispositional Logic and Commonsense Reasoning, Stanford CA, CSLI-88-117: Center for the Study of Language and Information (CSLI).
Rights and permissions
About this article
Cite this article
Entemann, C.W. Fuzzy Logic: Misconceptions and Clarifications. Artificial Intelligence Review 17, 65–84 (2002). https://doi.org/10.1023/A:1015055728744
Issue Date:
DOI: https://doi.org/10.1023/A:1015055728744