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10 lines
549 B
10 lines
549 B
\item \self Consider a formula $\varphi$ in propositional logic. In the
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following list, tick all statements that are true.
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\begin{itemize}
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\item[$\square$] If $\varphi$ is a tautology, a falsifying model can be found.
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\item[$\ticked$] If $\varphi$ is equivalent to $\psi$, a satisfying model for $\varphi$ always satisfies $\psi$.
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\item[$\square$] If $\varphi$ has no satisfying model, it is called a tautology.
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\item[$\square$] If $\varphi$ semantically entails $\psi$, a satisfying model for $\psi$ always satisfies $\varphi$.
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\end{itemize}
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