# Vertical space before and after align environment

I am wondering if it is possible in LaTeX to generally adjust the spacing before and after math in the align environment from amsmath.

From the Mathmode-guide (by Herbert Voss) I gather that \belowdisplayskip and friends should do the job, but manipulating them doesn't yield any visible results.

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## 1 Answer

It has a pretty clear effect to me:

\hrule
\begin{align}
f(x)&=x
\end{align}
\hrule
\vskip1cm
\belowdisplayskip=0pt
\hrule
\begin{align}
f(x)&=x
\end{align}
\hrule


Can you provide a minimal working example where it doesn't?

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It seems that the difference between yours and mine was that I put \belowdisplayskip=0pt in the preamble rather than after \begin{document}. Indeed, putting it after the preamble yields results. This had never occured to me :-/ .. but thanks for the answer :-) –  plc Sep 20 '10 at 19:58
@plc -- in many document classes, \belowdisplayskip is reset every time the text size (e.g., \small, etc.) is reset. although the reset is local, \normalsize is invoked as part of \begin{document}, overruling the setting you put in the preamble. –  barbara beeton Oct 16 '12 at 13:10