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FL (Fuzzy Logic) is a type of programming language that models human reasoning by using linguistic variables. Developed in the 1960s by Lofti Zadeh, this mathematical concept describes vagueness and uncertainty in qualitative terms rather than rigid binary logic. In FL, statements can be true to a certain degree and false to another degree at the same time. It's used in control systems for consumer electronics, home appliances, automotive gearboxes and climate control systems due to its ability to handle imprecise input data. The FL makes it easier to build control systems without having expert control engineers explicitly specify nature of the system mathematically – instead they use rules which work with approximate numbers or other inputs.

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