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16 lines
427 B
16 lines
427 B
Translation: \\
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$p:$ \quad Press button. \\
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$q:$ \quad Open window.
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\begin{tabbing}
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If I press the button, the window opens. \quad \= $p \imp q$ \\
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The window is open. \> $q$ \\
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Therefore, I pressed the button. \> $\vdash p$
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\end{tabbing}
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\emph{sequent:} \quad $p \imp q, q \vdash p$ \\
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This sequent is not provable.
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$\mathcal{M} : p = F, q = T$ \\
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$\mathcal{M} \models p \imp q, q$ \\
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$\mathcal{M} \nmodels p$
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