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8 lines
436 B
8 lines
436 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 $\lnot \phi$ is not satisfiable, $\phi$ is not valid.
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\item[$\square$] If $\top \models \phi$, $\phi$ is valid.
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\item[$\square$] If $\phi \leftrightarrow \psi$ is valid, $\phi$ entails $\psi$.
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\item[$\square$] If $\phi \imp \psi$ is valid, both formulas are equivalent.
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\end{enumerate}
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