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An extension of two-valued Logic such that statements need not be True or False, but may have a degree of truth between 0 and 1. Such a system can be extremely useful in designing control logic for real-world systems such as elevators.
See also Alethic, False, Logic, True
References
 
McNeill, D. and Freiberger, P.  Fuzzy Logic: The Discovery of a Revolutionary Computer Technology and How It is Changing Our World.
Nguyen, H. T. and Walker, E. A.  A First Course in Fuzzy Logic.  Boca Raton, FL: CRC Press, 1996.
 
Yager, R. R. and Zadeh, L. A. (Eds.)  An Introduction to Fuzzy Logic Applications in Intelligent Systems.
  Boston, MA: Kluwer, 1992.
 
Zadeh, L. and Kacprzyk, J. (Eds.).  Fuzzy Logic for the Management of Uncertainty.  New York: Wiley, 1992.
 
 Fuzzy Logic