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I am trying to add an acknowledgment section like. I have tried the 'acknowledgments' and 'acknowledgements' environments (as seen on the internet), but LaTeX did not recognized it.

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What document class are you using? If they're not recognized it's probably because you're using a document class where they're not defined. – N.N. Aug 16 '11 at 11:58
I'm using report class. The document is a master thesis. Is there any better class? – Alexandru Aug 16 '11 at 12:21

Most classes don't provide a environment for the acknowledgements. I do my acknowledgements for my thesis the following way:


I like to acknowledge ...


This adds a chapter-like headline without number on a page of its own. I like to also not have a page number for it. Afterwards flush the page using a \clearpage, just to be on the safe side.

If you writing a paper or other article-like document use \section* instead of \chapter* and skip the other commands.

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In a chapter based document:

\cleardoublepage% especially in a document where chapters start at right-hand pages
\phantomsection% for an anchor if you use hyperref
\addtocontents{toc}{chapter}{Acknowledgements}% if you wish to have a TOC entry
\chapter*{Acknowledgements}% for the actuall unnumbered heading
\thispagestyle{empty}% or plain etc.
\markboth{Acknowledgements}{Acknowledgements}% relevant depending on page style
    % or if it's more than one page

Similar with \section*, if required as section. Omit lines above which you don't need.

Here you might see, a macro name for Acknowledgements could be good, and using that, i.e.

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I want to put my Acknowledgement just before the TOC. Then where should I put these codes and which environment should I use? book or report? – omephy Mar 10 '14 at 10:00
@Ome Then put this code before \tableofcontents. report is usually a good choice, book is more book-like, default settings are different. You can switch between them at any time to see, how the layout changes. – Stefan Kottwitz Mar 10 '14 at 11:32

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