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21 lines
497 B

\begin{center}
\begin{forest}
for tree={circle, draw,
minimum size=2em,
inner sep=0pt,
s sep=2mm,
l sep=1mm}
[$\lnot$, name=not_one
[$\lor$, name=or
[$a$, name=a]
[$\lnot$, name=not_two
[$\lnot$, name=not_three
[$b$, name=b]
]
]
]
]
\end{forest}
\end{center}
Every leaf is a atomic variable and the other nodes are labeled with logical operators, thus this is a well-formed formula.