\documentclass[a4paper,11pt]{article}
\usepackage{latexsym}
\author{A. Einstein}
\title{The theory of relativity}

\begin{document}
\maketitle \tableofcontents
\section{Introduction}
 The Gallilean invariance holds for the Newton equations of motion but it does not hold in the case of Maxwell’s equations.
\section{Conclusions}
We showed that there exists an upper bound to all velocities and
that this bound is the speed of light in vacuum.
\end{document}
