main.tex

% !TeX root = main.tex

\documentclass[a4paper, 11pt, UTF8, oneside]{book}

\input{preamble}
\input{config}

\title{The magical Zilch book}
\newcommand{\shorttitle}{Zilch}

\author{Ghilain Bergeron}

\theoremstyle{definition}
\newtheorem{exmp}{Example}[section]

\onehalfspacing{}

\begin{document}

\input{index}

\end{document}