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  1. \item \self Look at the following statements and tick them if they are true.
  2. \begin{itemize}
  3. \item[$\square$] Any sequent that is a correct semantic entailment can be proven.
  4. \item[$\square$] Any sequent that can be proven is a correct semantic entailment.
  5. \item[$\square$] If a sequent is not provable, the semantic entailment relation does hold.
  6. \item[$\square$] If for a sequent the semantic entailment relation does not hold, it cannot be proven with natural deduction.
  7. \end{itemize}