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22 lines
480 B
22 lines
480 B
\begin{center}
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\begin{forest}
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for tree={circle, draw,
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minimum size=2em,
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inner sep=0pt,
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s sep=2mm,
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l sep=1mm}
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[$\lnot$, name=not_one
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[$\lor$, name=or
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[$a$, name=a]
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[$\lnot$, name=not_two
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[$b$, name=b
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[$\lnot$, name=not_three]
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]
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]
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]
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]
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\end{forest}
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\end{center}
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One leaf is labeled with a logical operator, which is not allowed.
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Thus this is not a well-formed formula.
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