There are several problems which I am dealing with.
Basically, I want to eliminate "Chapter 1" from the title of my introduction. In order to do that, I used
\chapter*{Introduction}
\addcontentsline{toc}{chapter}{\textbf{Introduction}}
The problem with this approach is that it does not change the headers, which remain the ones of the previous section ("Contents").
It should be noted that I have changed both the title and the headers format.
\documentclass[12pt, a4paper, twoside, openright]{book}
\usepackage{titlesec}
\usepackage{fancyhdr}
\titleformat{\chapter}[display]
{\vspace*{-10ex}\Large}
{\thispagestyle{empty}\titleline[l]{\chaptertitlename\ \thechapter}\vspace{6pt}\titlerule[.8pt]} {\dimexpr-\baselineskip+6pt\relax}
{\LARGE\bfseries\filleft}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\fancyhf{}
\fancyhead[LO]{\nouppercase{\rightmark}}
\fancyhead[RE]{\nouppercase{\leftmark}}
\fancyhead[LE,RO]{\thepage}
\begin{document}
\nocite{*}
\maketitle
\cleardoublepage\null\newpage
\tableofcontents
\chapter*{Introduction}
\addcontentsline{toc}{chapter}{\textbf{Introduction}}
\end{document}
Do you know how to solve this issue?
Furthermore, is it possible to restore the classic title format only for the introduction?


The problem is that I have to do the same for the Conclusion. Is it possible with your suggestion?
– Jonathan_Lo Jun 11 '17 at 07:54