Lotfi Zadeh

Quotes

• “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.”
• “[ Fuzzy logic is ] a logic whose distinguishing features are (i) fuzzy truth-values expressed in linguistic terms, e.g., true, very true, more or less true, or somewhat true, false, nor very true and not very false, etc2.; (2) imprecise truth tables; and (3) rules of inference whose validity is relative to a context rather than exact.”
• “A linguistic variable is defined as a variable whose values are sentences in a natural or artificial language.”
• “[T]he successes of modern control theory in the design of highly accurate space navigation systems have stimulated its use in the theoretical analyses of economic and biological systems. Similarly, the effectiveness of computer simulation techniques in the macroscopic analyses of physical systems has brought into vogue the use of computer-based econometric models for purposes of forecasting, economic planning, arid management.”
• “A linguistic variable is a variable whose values are words or sentences in a natural or synthetic language.”
• “Essentially, a fuzzy algorithm is an ordered sequence of instructions (like a computer program) in which some of the instructions may contain labels or fuzzy sets, e.g.: Reduce x slightly if y is very large Increase x very slightly if y is not very large and not very small If x is small then stop; otherwise increase x by 2.”

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Key facts

Born

Lotfi Aliasgerzadeh , ( 1921-02-04 ) 4 February 1921, Baku , Azerbaijan Soviet Socialist Republic

Died

6 September 2017 (2017-09-06) (aged 96) , Berkeley, California , US

Alma mater

University of Tehran Massachusetts Institute of Technology Columbia University

Known for

Founder of fuzzy mathematics , fuzzy set theory, and fuzzy logic , Z numbers, Z-transform

Spouse

Fay Zadeh

Children

2, including Norman Zada

Fields

Artificial intelligence Computer science Electrical engineering Mathematics

Institutions

University of California, Berkeley

Thesis

Frequency analysis of variable networks (1949)

Doctoral advisor

John R. Ragazzini

Doctoral students

Joseph Goguen John Yen

via Wikipedia infobox

Wikidata facts

Image

Zadeh, L.A. 2005.jpg

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