What and Define Tautology and contradiction

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A formula of propositional logic is a tautology if the formula itself is always true, regardless of which valuation is used for the propositional variables. For example, $A \lor \lnot A$ .

A formula of propositional logic is a contradiction if the formula itself is conflict with itself. For example, $A \land \lnot A$ .

What and Define Tautology and contradiction

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