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Questionnaire-2024/natural_deduction_propositi.../1004_sol.tex

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added ndprop chapter
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  1. This sequent is not provable.
  3. $\mathcal{M} : a = F, b = F, c = F$ \\
  4. $\mathcal{M} \models \lnot(a \land b) \lor \lnot c$ \\
  5. $\mathcal{M} \nmodels \lnot (a \land b) \imp c \lor a$