Frases de Lotfali Askar-Zadeh

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Lotfali Askar-Zadeh

Data de nascimento: 4. Fevereiro 1921
Data de falecimento: 6. Setembro 2017


Lotfali Askar-Zadeh, em azeri: Lütfi Əsgərzadə, em persa: لطفعلی عسکرزاده, mais conhecido como Lotfi A. Zadeh , foi um matemático, engenheiro eletrônico e cientista da computação estadunidense nascido no Azerbaijão, e professor de ciência da computação na Universidade da Califórnia em Berkeley.

Emigrou para o Irão para estudar na Universidade de Teerão e depois para os Estados Unidos em 1944, onde continuou os estudos no Instituto de Tecnologia de Massachusetts, na Universidade de Colúmbia e por fim na Universidade de Berkeley. É famoso por introduzir em 1965 a teoria de conjuntos difusos ou lógica difusa. É considerado o "pai" da teoria da possibilidade.

Pelos seus contributos neste campo recebeu vários prémios, entre os quase se destaca a Medalha Richard W. Hamming em 1992 e doutoramentos honoris causa de várias instituições de todo o mundo.

Citações Lotfali Askar-Zadeh

„It was a biologist — Ludwig von Bertalanffy — who long ago perceived the essential unity of system concepts and techniques in the various fields of science and who in writings and lectures sought to attain recognition for “general systems theory” as a distinct scientific discipline. It is pertinent to note, however, that the work of Bertalannfy and his school, being motivated primarily by problems arising in the study of biological systems, is much more empirical and qualitative in spirit than the work of those system theorists who received their training in exact sciences.
In fact, there is a fairly wide gap between what might be regarded as “animate” system theorists and “inanimate” system theorists at the present time, and it is not at all certain that this gap will be narrowed, much less closed, in the near future.
There are some who feel this gap reflects the fundamental inadequacy of the conventional mathematics—the mathematics of precisely defined points, functions, sets, probability measures, etc.—for coping with the analysis of biological systems, and that to deal effectively with such systems, we need a radically different kind of mathematics, the mathematics of fuzzy or cloudy quantities which are not describable in terms of probability distributions. Indeed the need for such mathematics is becoming increasingly apparent even in the realms of inanimate systems“

—  Lotfi A. Zadeh
Zadeh (1962) "From circuit theory to system theory", Proceedings I.R.E., 1962, 50, 856-865. cited in: Brian R. Gaines (1979) " General systems research: quo vadis?", General Systems, Vol. 24 (1979), p. 12


„To what degree is something true or false?“

—  Lotfi A. Zadeh
Attributed to Zadeh in: " What is Fuzzy Logic?" in: Azerbaijan international Vol 2.4 (Winter 1994). p. 47 This quote is introduced as "The question Zadeh always insists upon asking".


„In general, complexity and precision bear an inverse relation to one another in the sense that, as the complexity of a problem increases, the possibility of analysing it in precise terms diminishes. Thus 'fuzzy thinking' may not be deplorable, after all, if it makes possible the solution of problems which are much too complex for precise analysis.“

—  Lotfi A. Zadeh
Zadeh (1972) "Fuzzy languages and their relation to human intelligence". in: Proceedings of the International Conference Man and Computer, Bordeaux, France. Basel: S. Karger, pp. 130-165. cited in Gaines (1976) "Foundations of fuzzy reasoning" in: International Journal of Man-Machine Studies 8(6), p. 624