\documentclass[a4paper]{book}

\usepackage[utf8]{inputenc}
\usepackage[french]{babel}
%\usepackage[UKenglish]{babel}
\usepackage[T1]{fontenc}
\usepackage{libertine}

\usepackage{amsmath, amssymb, mathrsfs}
\usepackage{amsthm}

\usepackage{pdfpages}

\title{}
\author{}
\date{}

\begin{document}
\pagenumbering{roman}
\includepdf{garde.pdf}

\pagestyle{empty}

\input acknowledgements

\end{document}