In propositional logic, a tautology (from the Greek word ??????????) is a propositional formula that is true under any possible valuation (also called a truth assignment or an interpretation) of its propositional variables.
In propositional logic, a tautology (from the Greek word ??????????) is a propositional formula that is true under any possible valuation (also called a truth assignment or an interpretation) of its propositional variables.