# Chapter style like this without memoir?

I was looking for style inspiration for my thesis and I came across this chapter style:

As far as I am concerned memoir class is capable of this kind of typography like specified in Bringhurst chapter style in memoir, but I am trying to produce it using the book class. I would be grateful if someone in here can share his/her knowledge about the code used to produce this style.

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 – Claudio Fiandrino Mar 7 at 10:38

Here's some possibility using the titlesec package and a font admitting large sizes; adjust the settings according to your needs:

\documentclass{book}
\usepackage[explicit]{titlesec}
\usepackage{lmodern}
\usepackage{lipsum}

\newlength\chapnumb
\setlength\chapnumb{4cm}

\titleformat{\chapter}[block]
{\normalfont\sffamily}{}{0pt}
{\parbox[b]{\chapnumb}{%
\fontsize{120}{110}\selectfont\thechapter}%
\parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{%
\raggedleft%
\hfill{\LARGE#1}\\
\rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt}}}
\titleformat{name=\chapter,numberless}[block]
{\normalfont\sffamily}{}{0pt}
{\parbox[b]{\chapnumb}{%
\mbox{}}%
\parbox[b]{\dimexpr\textwidth-\chapnumb\relax}{%
\raggedleft%
\hfill{\LARGE#1}\\
\rule{\dimexpr\textwidth-\chapnumb\relax}{0.4pt}}}

\begin{document}

\chapter*{A Long Title for an Unnumbered Test Chapter}
\lipsum[4]
\chapter{Introduction}
\lipsum[4]

\end{document}


An image for an unnumbered (starred) chapter:

An image for a numbered chapter:

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 Thank you for the fast reply. Works like a charm! – dkc Mar 7 at 14:28