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Probability theory is an ideal tool for formalizing uncertainty in situations where class frequencies are known or where evidence is based on outcomes of a sufficiently long series of independent random experiments. Possibility theory, on the other hand, is ideal for formalizing incomplete information expressed in terms of fuzzy propositions.

— George Klir Fuzzy sets and fuzzy logic (1995)

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More quotes by George Klir

No classification is complete and perfect for all purposes.

An approach to general systems theory (1969)

Systems science is a science whose domain of inquiry consists of those properties of systems and associated problems that emanate from the general notion of systemhood.

George Klir (2001)

The first stage of the transition from the traditional view to the modem view of uncertainty began in the late 19th century, when physics became concerned with processes at the molecular level.

Fuzzy sets and fuzzy logic (1995)

The term “system” is unquestionably one of the most widely used terms not only in science, but in other areas of human endeavor as well. It is a highly overworked term, which enjoys different meanings under different circumstances and for different people. However, when separated from its specific connotations and uses, the term "system" is almost never explicitly defined.

Facets of Systems Science (2001)

To select an appropriate fuzzy implication for approximate reasoning under each particular situation is a difficult problem. Although some theoretically supported guidelines are now available for some situations, we are still far from a general solution to this problem.

Fuzzy sets and fuzzy logic (1995)

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Quote text and notes from Wikiquote: George Klir (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.