\begin{theindex}

  \item binary tree, \hyperpage{7}

  \indexspace

  \item child, \hyperpage{1}

  \indexspace

  \item diameter, \hyperpage{3}

  \indexspace

  \item in-order, \hyperpage{7}

  \indexspace

  \item leaf, \hyperpage{1}

  \indexspace

  \item parent, \hyperpage{1}
  \item post-order, \hyperpage{7}
  \item pre-order, \hyperpage{7}

  \indexspace

  \item root, \hyperpage{1}
  \item rooted tree, \hyperpage{1}

  \indexspace

  \item subtree, \hyperpage{1}

  \indexspace

  \item tree, \hyperpage{1}

\end{theindex}