[Tex/LaTex] How to center an unnumbered section name

sectioning

I have a chapter chap1.tex in latex project project.tex which has the following sections:

\chapter{Overview}
    \section*{Introduction}
    \section{Model}
    \section{Discussion}

When I run my latex project project.tex, I will get something like this:
enter image description here

I would like to make Introduction in the center. How to do this?

I tried \centering\section*{Introduction}

Best Answer

Since you are using a \section* for it, there are no complications for the table of contents.

\documentclass{book}

\begin{document}
\tableofcontents

\chapter{Overview}
    \section*{\hfil Introduction\hfil}
    \section{Model}
    \section{Discussion}
\noindent\hrulefill
\end{document}

enter image description here

To address both a possible criticism of non-generality as well as the suggestion of egreg, one could implement the above idea as shown below:

\documentclass{book}
%\def\myformat#1{\hfil #1\hfil}% OR ALTERNATELY
\def\myformat#1{\centering#1}
\begin{document}
\tableofcontents

\chapter{Overview}
    \section*{\myformat{Introduction}}
    \section{Model}
    \section{Discussion}
\noindent\hrulefill
\end{document}

In this way, a desire at some future point to change the format for all such starred sections would require only a single-line change to the document, that is, the definition of \myformat.

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