Greek philosopher Heraclitus who believed that things can be simultaneously ‘true’ and ‘not true’. e
Greeks toyed with such ideas until Aristotle and his two valued logic gained ground. Around the same
time as Zadeh, Dieter Klaua also proposed a similar concept (Klaua, D. (1965) Über einen Ansatz zur
mehrwertigen Mengenlehre. Monatsb. Deutsch. Akad. Wiss. Berlin 7, 859–867). Like all revolutionary
notions, the concept of fuzzy sets too was viewed initially with lot of skepticism and many rated it merely
as an extension of probability theory. It wasn’t until the early 1980’s that it gained popular ground, and it
was around this time that the ...
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