Question: Let phi be a boolean formula constructed from the boolean input variables x_1, x_2, .. X_k, negations (not), ANDs (logicaland), ORs (logicalor), and parentheses. The

Let phi be a boolean formula constructed from the boolean input

Let phi be a boolean formula constructed from the boolean input variables x_1, x_2, .. X_k, negations (not), ANDs (logicaland), ORs (logicalor), and parentheses. The formula is a tautology if it evaluates to 1 for every assignment of 1 and 0 to the input variables. Define TAUTOLOGY as the language of boolean formulas that are tautologies. Show that TAUTOLOGY element co-NP

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