1. A fuzzy logic system having an input fuzzifier to generate membership functions for multiple number of labels for each antecedent and a defuzzifier to yield a crisp output from the membership functions of multiple number of output labels, comprising: at least one single device with multiple folding voltage-curent (V-I) characteristics, means for simulating the membership functions with the current of said charactersitics and said antecedent with the voltage of said charactersitics, wherein the overlapping sections of adjacent labels is obtained by: means for adding a first current to the current of said device to obtain an additive folding V-I characterstic, means for subtracting from a second current the current of said device to obtain a subtractive folding V-I characteristic, and means for combining said additive folding folding V-I charcteristic and said subtractive folding V-I characteristic to obtain said overlapping membership functions.