Fuzzy Logic was invented by Lofti Zadeh at the University of California at Berkeley.
Many systems are too complex to be modeled using mathematics.
Fuzzy logic is a methodology for expressing operational laws of a system in linguistic terms instead of mathematical equations. These linguistic terms are often expressed in the form of logical implications, such as If-Then rules. The terms HOT and LOW are actually sets that define a range of values known as membership functions. By choosing a range of values we can control the temperature more precisely. To illustrate this, consider a non-fuzzy logic controller for this problem.