Page:Carroll - Game of Logic.djvu/90

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    Let "books" be Universe; $m$ = "exciting", $x$ = "that suit feverish patients"; $y$ = "that make one drowsy".

    No $m$ are $x$; No $m^{\prime }$ are $y$.

    $\scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}$

    ∴ No $y^{\prime }$ are $x$.

    i.e. No books suit feverish patients, except such as make one drowsy.

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    Let "persons" be Universe; $m$ = "that deserve the fair": $x$ = "that get their deserts"; $y$ = "brave".

    Some $m$ are $x$; No $y^{\prime }$ are $m$.

    $\scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}$

    ∴ Some $y$ are $x$.

    i.e. Some brave persons get their deserts.

[See p. 52]