Editing Vagueness (section)

=== Fuzzy logic ===
[[File:Fuzzy logic temperature en.svg|thumb|In fuzzy logic, e.g. the predicates ''cold'', ''warm'', and ''hot'' apply gradually (vertical axis, 0 and 1 meaning ''certainly not'' and ''certainly'', respectively) to a given temperature (horizontal axis).]]
{{main|Fuzzy logic}}
One theoretical approach is that of fuzzy logic, developed by American mathematician [[Lotfi Zadeh]]. Fuzzy logic proposes a gradual transition between "perfect falsity", for example, the statement "[[Bill Clinton]] is bald", to "perfect truth", for, say, "[[Patrick Stewart]] is bald". In ordinary logics, there are only two [[truth-value]]s: "true" and "false". The fuzzy perspective differs by introducing ''an infinite number of truth-values'' along a spectrum between perfect truth and perfect falsity. Perfect truth may be represented by "1", and perfect falsity by "0". Borderline cases are thought of as having a "truth-value" anywhere between 0 and 1 (for example, 0.6). Advocates of the fuzzy logic approach have included K. F. Machina (1976)<ref>Machina, K.F. 1976. "Truth, Belief and Vagueness", in ''[[Journal of Philosophical Logic]]'' Vol. 5. pp. 47-78.</ref> and [[Dorothy Edgington]] (1993).<ref>{{cite book| author=Edgington, D.| title=Vagueness by degrees| year=1997| pages=294–316| publisher=MIT Press| editor=Keefe, R. |editor2=Smith, P.| url=http://www.jo_syp.republika.pl/media/vbd.pdf}}</ref>