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8 lines
565 B
8 lines
565 B
\item \self Given a propositional logic formula $\varphi$.
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Tick all statements that are true.
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\begin{enumerate}
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\item[$\square$] A formula $\phi$ is \textit{valid}, if and only if $\lnot \phi$ is \textit{satisfiable}.
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\item[$\square$] A formula $\psi$ is \textit{satisfiable}, if and only if $\lnot \phi$ is \textit{valid}.
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\item[$\square$] A formula $\phi$ is \textit{satisfiable}, if and only if $\lnot \phi$ is \textit{not valid}.
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\item[$\square$] A formula $\phi$ is \textit{valid}, if and only if $\lnot \phi$ is \textit{not satisfiable}.
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\end{enumerate}
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