Remove spacing before \chapter in LaTeX [closed]

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I am using the book style to write a research report and would like to know how to remove the top vertical space before a chapter heading. I need this for the 'Abstract' page. I would like it to start nearer to the top than standard chapters.

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Here is some sample code using the titlesec package, Stefan's suggestion. The titleformat command leaves everything at default values, but you need to include it (I think) for the titlespacing changes to work. The second titlespacing command sets back to default values, with assumption that you wanted altered spacing only for first chapter:

\documentclass{book}

\usepackage{titlesec}

\titleformat{\chapter}[display]
{\normalfont\huge\bfseries}{\chaptertitlename\ \thechapter}{20pt}{\Huge}

% this alters "before" spacing (the second length argument) to 0
\titlespacing*{\chapter}{0pt}{0pt}{40pt}

\begin{document}

\chapter{One}
 % this changes "before" spacing back to its default of 50pt
\titlespacing*{\chapter}{0pt}{50pt}{40pt}
First sentence of chapter.

\chapter{two}
First sentence of chapter.

\chapter{three}
First sentence of chapter.

\end{document}

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An easy way is using the titlesec package. The appendix 9.2 of its documentation shows how the standard classes typeset their headings - it's not hard to copy and to modify those commands according to the own requirements.

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Having the same issue, i tried out the titlesec solution, which somehow didn't work as expected (too many errors with Texshop 2.47 on OsX).

However, i worked out a simpler solution (at least for my case) with the geometry package. The deal is to call a new page geometry only for the page of interest and then restore the page geometry defined by fncychap.

% in the preamble
\documentclass[11pt,a4paper,twoside,openright]{book}
\usepackage{geometry}
\usepackage[Sonny]{fncychap}

% in the document
\frontmatter

% adapt geometry options to your needs
\newgeometry{textwidth=16cm,textheight=28cm,voffset=-2cm,bottom=0cm}
\chapter*{Abstract}
\markboth{}{}
\addcontentsline{toc}{chapter}{Abstract}
% text
\restoregeometry
% from now on fncychap takes over again
\mainmatter