In science, fuzzy entropy is the entropy of a fuzzy set, loosely representing the information of uncertainty. [1] The fuzzy entropy is peculiar to mathematics, information theory, and computer science, tracing to the fuzzy set (1965) and fuzzy logic (1973) theories of Iranian-born American electrical engineer and computer scientist Lotfi Zadeh, who extended the Claude Shannon entropy theory to be applied as a fuzzy entropy of a fuzzy subset for a finite set. [2] The conception of fuzzy entropy, in some publications, seems to find crude overlap, carrying thermodynamic connotations into other fields, although mostly baseless.

Human systems
In 1992, Polish-born, American industrial engineer Waldemar Karwowski developed a theory of human entropy, in what seems to be based on fuzzy entropy logic. [3] The French website EntropyAndThen.net run by a Joseph Martin, for instance, is devoted to the calculations of fuzzy entropy production by humans. [4] It is extremely likely, however, that these extraplations have little merit.

References
1. Wang, Lipo, Jin, Yaochu. (2005). Fuzzy Systems and Knowledge Discovery, (section: Fuzzy entropy, pgs. 204-09). Springer Science & Business.
2. (a) Anon. (2001). The 1oth IEEE International Conference on Fuzzy Systems, (pg. 1136). Institute of Electrical and Electronics Engineers.
(b) Kosko, Bart. (1992). Neural Networks and Fuzzy Systems: A Dynamical Systems Approach to Machine Intelligence, (section: The Fuzzy Entropy Theorem, pg. 277). Prentice Hall.
3. (a) Karwowski, Waldemar. (1992). “The human world of fuzziness, human entropy, and the need for the general fuzzy systems theory.” Journal of Japan Society for Fuzzy Theory and Systems, 4, 591-609.
(b) Karwowski, Waldemar. (1995). “A general modeling framework for the human-computer interaction based on the principle of ergonomic compatibility requirements and human entropy.” In Grieco, A. Molteni, G., Occhipinti, E. and Piccoli, B. (eds.) Work witrh Display Units 94 (Amesterda: North-Holland), pgs. 473-8.
4. Fuzzy Entropy (definition) – EntropyAndThen.net

Further reading
● Ivancevic, Vladimir G. and Ivancevic, Tijana T. (2006). Natural Biodynamics, (section: Fuzzy Entropy, pgs. 759). World Scientific.