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Questionnaire-2024
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Questionnaire-2024/natural_deduction_propositi.../0064_sol.tex

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