Editing Fuzzy logic (section)

===Linguistic variables===
In fuzzy logic applications, non-numeric values are often used to facilitate the expression of rules and facts.<ref>{{cite book |last1=Zadeh |first1=L. A. |display-authors=etal |title=Fuzzy Sets, Fuzzy Logic, Fuzzy Systems |date=1996 |publisher=World Scientific Press |isbn=978-981-02-2421-9 }}</ref>

A linguistic variable such as ''age'' may accept values such as ''young'' and its antonym ''old''. Because natural languages do not always contain enough value terms to express a fuzzy value scale, it is common practice to modify linguistic values with [[adjectives]] or [[adverbs]]. For example, we can use the [[hedge (linguistics)|hedges]] ''rather'' and ''somewhat'' to construct the additional values ''rather old'' or ''somewhat young''.<ref>{{cite journal |last1=Zadeh |first1=L. A. |title=The concept of a linguistic variable and its application to approximate reasoning—I |journal=Information Sciences |date=January 1975 |volume=8 |issue=3 |pages=199–249 |doi=10.1016/0020-0255(75)90036-5 }}</ref>