Propositional variable
Variable that can either be true or false / From Wikipedia, the free encyclopedia
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In mathematical logic, a propositional variable (also called a sentence letter,[1] sentential variable, or sentential letter) is an input variable (that can either be true or false) of a truth function. Propositional variables are the basic building-blocks of propositional formulas, used in propositional logic and higher-order logics.