答案1
这可以通过以下包完成titlesec
。
\documentclass{book}
\usepackage{titlesec}
\titleformat{\chapter}{\bfseries\Large}{Chapitre\quad\thechapter}{0mm}{\newline\hrule\vspace*{.5\baselineskip}\centering\uppercase}
\begin{document}
\setcounter{chapter}{3}
\chapter{Pricing european options in a discrete time model for the limit order book}
\end{document}