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Questionnaire-2024
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Questionnaire-2024/natural_deduction_propositi.../0063_sol.tex

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added ndprop chapter
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  1. This sequent is not provable.
  3. $\mathcal{M} : p = T, q = T, r = T, s = F$ \\
  4. $\mathcal{M} \models \neg (p \land q) \lor \neg (r \land s)$ \\
  5. $\mathcal{M} \nmodels (\neg p \land \neg r) \lor (\neg q \land \neg s)$