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8 lines
472 B
8 lines
472 B
\item \self Given two propositional logic formulas $\varphi$ and $\psi$.
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Tick all statements that are true.
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\begin{enumerate}
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\item[$\square$] If $\phi \land \lnot \psi$ is not satisfiable, $\phi$ entails $\psi$.
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\item[$\square$] If $\lnot \phi$ is not valid, $\phi$ is satisfiable.
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\item[$\square$] If $\phi$ entails $\psi$ and $\psi$ entails $\phi$, both formulas are equivalent.
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\item[$\square$] If $\phi$ is equivalent to $\top$, $\phi$ is valid..
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\end{enumerate}
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