\documentclass[10pt]{report}
\input{preamble.tex}

\raggedcolumns
\begin{document}

\begin{center}
  \Large \textbf{Formula sheet for Algebraic combinatorics}
\end{center}

\setlength{\columnseprule}{0.1pt}
\setlength{\columnsep}{25pt}

\begin{multicols*}{2}
  \input{formulae.tex}
\end{multicols*}
\end{document}