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Questionnaire-2024/propositional_logic/theory_questions/4_4_notions_lect_sol.tex

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  1. Given a formula $\varphi$ in propositional logic, we say that $\varphi$ is
  2. \emph{satisfiable} if it has a model in which is evaluates to \emph{true}.
  3. We say that $\varphi$ is
  4. \emph{unsatisfiable} if there is no model under which $\varphi$ evaluates to \emph{true}.