# Propositional Variable

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## Propositional Variable

a variable whose range of values consists of the two truth values “true” and “false” (but not of true and false propositions, as the term, at first glance, might appear to indicate). Symbols used as propositional variables are required, for example, in describing the propositional calculus and other systems of mathematical logic.

References in periodicals archive ?
Aristotle's Thesis is a negated conditional, which consists of one propositional variable with a negation either in the antecedent (version 1) or in the consequent (version 2).
In this paper we focus on the intuitionistic propositional logic with one propositional variable.
n); xj being a literal (a propositional variable or its negation).
The basic idea of this encoding is that each term can be represented uniquely by a valuation of a set of propositional variables, such that for each fluent f the propositional variable [Z.
Gamma] + [Lambda], [Delta] + [Pi]), and A is a propositional variable in S.
where "x" is a first-order variable and "P" is a propositional variable that has the same range as "x".
For any object x we introduce a propositional variable X which denotes the computability of x.
We can see it as a proposition and we can associate it a propositional variable that represents it.
For example, in the context of the dinner-date problem described previously, the propositional variable [garb.
More generally, in this intensional setting a single propositional variable about which we know nothing else but that it is assumed to be true logically implies nothing but itself.
These formulas extend propositional formulas by allowing both universal and existential quantifiers over propositional variables, and are useful for modeling problems in artificial intelligence and computer science.

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