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This is what I want:

Chapter 1 : Introduction

but I always get:

Chapter 1


How do I do this?

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:D Thanks for reference, yups :) – Verly Aug 8 '11 at 4:31
up vote 5 down vote accepted

If you use a KOMA-class you will not need the package titlesec:

\chapter{A chapter}
\section{A section}
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with other classes, it is still possible to redefine the chapter look without using titlesec. – pluton Aug 6 '11 at 15:23
@pluton: Of course but the standard classes don't allow it in such an easy way :-). – Marco Daniel Aug 6 '11 at 15:46
I know tex.stackexchange.com is really nice place, Thanks Marco – Verly Aug 8 '11 at 4:30

You don't say which document class you are using, but for the standard classes, you can adjust these parameters easily with the titlesec package.

{\normalfont\huge\bfseries}{\chaptertitlename\ \thechapter:}{1em}{} 

\chapter{A chapter}
\section{A section}

output of code

You can change the font size as needed, and if you need to change the spacing, there is also a command for that.

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Great, Thanks Alann Munn :) – Verly Aug 8 '11 at 4:29

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