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