In the mid-1960's I had the pleasure of attending a talk by Lotfi Zadeh
at which he presented some of his basic (and at the time, recent) work
on fuzzy sets. Lotfi's algebra of fuzzy subsets of a set struck me as
very nice; in fact, as a graduate student in the mid-1950's, I had
suggested similar ideas about continuous-truth-valued propositional
calculus (inffor "and", sup for "or") to my advisor, but he didn't go
for it (and in fact, confused it with the foundations of probability
theory), so I ended up writing a thesis in a more conventional area of
mathematics (differential algebra). I especially enjoyed Lotfi's
discussion of fuzzy convexity; I remember talking to him about possible
ways of extending this work, but I didn't pursue this at the time. I
have elsewhere told the story of how, when I saw C. L. Chang's 1968
paper on fuzzy topological spaces, I was impelled to try my hand at
fuzzi- fying algebra. This led to my 1971 paper "Fuzzy groups", which
became the starting point of an entire literature on fuzzy algebraic
structures. In 1974 King-Sun Fu invited me to speak at a U. S. -Japan
seminar on Fuzzy Sets and their Applications, which was to be held that
summer in Berkeley.