Single Idea 8945

[catalogued under 4. Formal Logic / E. Nonclassical Logics / 4. Fuzzy Logic]

Full Idea

In fuzzy logic objects have properties to a greater or lesser degree, and truth values are given as fractions or decimals, ranging from 0 to 1. Not-p is defined as 1-p, and other formula are defined in terms of maxima and minima for sets.

Gist of Idea

Fuzzy logic has many truth values, ranging in fractions from 0 to 1

Source

Jennifer Fisher (On the Philosophy of Logic [2008], 07.II)

Book Reference

Fisher,Jennifer: 'On the Philosophy of Logic' [Thomson Wadsworth 2008], p.100


A Reaction

The question seems to be whether this is actually logic, or a recasting of probability theory. Susan Haack attacks it. If logic is the study of how truth is preserved as we move between propositions, then 0 and 1 need a special status.