A basic expression of a logical language which is used as a place-holder in a formula. It does not have a specific reference but stands for an unspecified value. In first order predicate logic, individual variables ranging over individuals are the only variables used, but in higher order logic and type logic variables can also range over sets, relations and functions of diverse complexity.
- Chomsky, N. 1981. Lectures on Government and Binding, Foris, Dordrecht.
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