The following code is in the preamble of my LaTeX document:
\documentclass{llncs}
\usepackage{amsmath,amssymb}
\usepackage{url}
\usepackage[algoruled,vlined]{algorithm2e}
\usepackage{graphicx,subfigure}
\usepackage{hyperref}
\hypersetup{colorlinks=true,citecolor=blue}
\numberwithin{equation}{section} % numbering according to the section
\bibliographystyle{plain} %Choose a bibliograhpic style
\begin{document}
\title{The Title}
\maketitle
\section{A}
\label{sect:A}
\subsection{a}
\subsection{b}
% ...
\section{B}
\label{sect:B}
\subsection{a}
\subsection{b}
% ...
\section{C}
\label{sect:C}
\subsection{a}
\subsection{b}
% ...
\end{document}
Note that the text is organized into sections and subsection. However, after compiling the code, the Adobe PDF preview does not show the "tree" branching on the left. Instead, it just shows "The Title", and that option has no branching with the "+/-" sings. How could I achieve this?
\sections and\subsections here. Please have a look if it is right. – Martin Scharrer Apr 18 '12 at 11:03llncsclass can be found at http://www.springer.com/computer/lncs?SGWID=0-164-6-793341-0 if someone wants to compile the example. – Martin Scharrer Apr 18 '12 at 11:05llncs– egreg Apr 18 '12 at 12:29