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9 months ago
  1. \item \lect Consider the propositional formula $\varphi = \neg (\neg p
  2. \vee q) \rightarrow (p \wedge \neg r)$.
  3. Find a propositional formula $\psi$ that is syntactically
  4. different from $\varphi$, but semantically equivalent to
  5. $\varphi$. Show the semantic equivalence of $\varphi$ and
  6. $\psi$ using truth tables.