In 1965, Lofti Zadeh published his seminal paper “Fuzzy Sets”  which described fuzzy set theory and consequently fuzzy logic. The purpose of Zadeh’s paper was to develop a theory which could deal with ambiguity and imprecision of certain classes or sets in human thinking, particularly in the domains of pattern recognition, communication of information, and abstraction. This theory proposed making the grade of membership of an element in a subset of a universal set a value in the closed interval [0,1] of real numbers.
KeywordsEquivalence Relation Similarity Relation Fuzzy Subset Fuzzy Relation Fuzzy Graph
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