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Questionnaire-2024
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Questionnaire-2024/natural_deduction_propositi.../0061_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. $\mathcal{M} \models (p \imp (q \imp r)) \lor (q \imp (r \imp s))$ \\
  5. $\mathcal{M} \nmodels p \imp (q \imp s)$