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7 lines
328 B
7 lines
328 B
\item \lect Consider the propositional formula $\varphi = \neg (\neg p
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\vee q) \rightarrow (p \wedge \neg r)$.
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Find a propositional formula $\psi$ that is syntactically
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different from $\varphi$, but semantically equivalent to
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$\varphi$. Show the semantic equivalence of $\varphi$ and
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$\psi$ using truth tables.
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