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Questionnaire-2024/natural_deduction_propositi.../0077_sol.tex

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