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Many-valued logic refers to a propositional calculus in which there are more than two truth values. Traditionally, in Aristotle's logical calculus, there were only two possible values for any proposition. Classical two-valued logic may be extended to n-valued logic for n greater than 2. Those most popular in the literature are three-valued , four-valued, nine-valued, the finite-valued with more than three values, and the infinite-valued , such as fuzzy logic and probability logic.
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