# How do I suppress the whitespace above an equation block at the page top?

How do I suppress the whitespace above the equation block at the page top ? It is added to the top margin, and I don't want that to happen. I know that \abovedisplayshortskip controls this for the whole document, but how can I change this for this particular equation block and NOT for any others ? Negative vspace doesn't work.

\documentclass[pdftex,12pt,a4paper,english,dutch,leqno]{article}
\usepackage{babel}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{empheq}

\begin{document}

\abovedisplayskip=6pt
\abovedisplayshortskip=3pt % This should NOT be changed
\belowdisplayskip=6pt
\belowdisplayshortskip=3pt

\begin{equation*}
\left.\begin{array}{r}
a_{31}'=a_{11}\cdot a_{31}-a_{31}\cdot a_{11}=0\\
a_{32}'=a_{11}\cdot a_{32}-a_{31}\cdot a_{12}\\
a_{33}'=a_{11}\cdot a_{33}-a_{31}\cdot a_{13}\\
a_{34}'=a_{11}\cdot a_{34}-a_{31}\cdot a_{14}\\
b_{3}'=a_{11}\cdot b_{3}-a_{31}\cdot b_{1}
\end{array}\!\!\right\}
\Longrightarrow\;
\begin{matrix*}[l]
\text{Pseudo-code :}\\
a_{11}\cdot b_{3}-a_{31}\cdot b_{1}\mapsto b_{3}\text{.}\\
\forall\;i\in\{4,3,2,1\} : a_{11}\cdot a_{3i}-a_{31}\cdot a_{1i}\mapsto a_{3i}\text{.} \end{matrix*}
\end{equation*}

\end{document}

-
If the problem is that you need to move the display to the next page, add \pagebreak at the end of the text that precedes the display. The space will automatically disappear. –  egreg Nov 6 '12 at 15:49
It is strongly discouraged to start a page with displayed formulas. –  Hendrik Vogt Nov 6 '12 at 16:38

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