You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
13 lines
371 B
13 lines
371 B
This sequent is not provable.
|
|
|
|
Model $\mathcal{M}$:\\
|
|
\begin{minipage}{0.2\textwidth}
|
|
\begin{align*}
|
|
\mathcal{A} =& \; \{ a,b \}\\
|
|
P^\mathcal{M} =& \; \{ a,b \}\\
|
|
Q^\mathcal{M} =& \; \{ a \}
|
|
\end{align*}
|
|
\end{minipage}\\
|
|
|
|
$\mathcal{M} \models \forall x \exists y \; (P(x) \imp Q(y)), P(s)$\\
|
|
$\mathcal{M} \nmodels \exists x \forall y \; (\lnot P(x) \lor Q(y))$
|