One of the basic objects treated in a given formal language system. The term is sometimes also used as a synonym for urelement.
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ReferencesCarnap, R. Introduction to Symbolic Logic and Its Applications. New York: Dover, p. 4, 1958.
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Weisstein, Eric W. "Individual." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Individual.html