The creator of fuzzy logic: **Lotfi A. Zadeh,** has died at the age of 97, in Berkeley (United States), on September 6.

**Fuzzy logic** is a technique that has made it possible for computers, and machines in general, to understand imprecise instructions such as ‘brake gently’ or ‘cool until the air is cool’. In the last 50 years, fuzzy logic has generated more than 50,000 patents in Japan and the United States alone.

## Lotfi A. Zadeh

Zadeh (Azerbaijan, 1921) first described "fuzzy sets" in 1965 in a publication that would become one of the most cited of the 20th century, **with more than 35,000 mentions** . From this, the so-called fuzzy logic was developed.

What is diffuse, blurred, imprecise or vague is not the logic itself, but the object it studies: it expresses the lack of definition of the concept to which it is applied. It is based on heuristic rules of the form IF (antecedent) THEN (consequent), where the antecedent and consequent are also fuzzy sets.

In Artificial Intelligence, fuzzy logic, or fuzzy logic, is used to solve a variety of problems, mainly those related to complex industrial process control and decision systems in general, data resolution and compression.

Author of 245 ‘papers’, **his research has been cited more than 90,000 times** . Lotfi Zadeh is also credited, along with John R. Ragazzini, in 1952, with pioneering the development of the z transform, a method of discrete time signal processing and analysis. These methods are now the standard in digital signal processing, digital control, and other discrete time systems in industry and research. He also held editorial positions in 75 specialized magazines. In 2012, Zadeh received the BBVA Foundation Frontiers of Knowledge Award in the Information and Communication Technologies (ICT) category.