alignamsmathspacing
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.
no fair blaming this problem on align. the same thing happens with equation and no amsmath. in the provided code, comment out \usepackage{amsmath} and replace all instances of align* with equation (sorry, no * available, so you'll get display numbers), and you'll get this result:
one gets the same result using \[ ... \] only (as expected) without the numbers.
it's still a problem, but deeper in the guts of (la)tex.
[Note: the improvement below, actually does not work.]
[Note: there is an important improvement to this code below.]
The closest I can get to a solution is
\documentclass[10pt,a4paper]{article}
\usepackage{amsmath,amsthm,mathtools}
\begin{document}
\begin{proof}
\begin{align*}
15 &= 5+4+3+2+1 = \sum_{i=1}^5 i \\
120&=5\cdot4\cdot3\cdot2\cdot1 = 5! \\
\shortintertext{
\[ e^{\pi i} + 1 = 0 \]
\[ x^n + y^n = z^n \]
}
27 &= 3^3 \qedhere
\end{align*}
\end{proof}
\end{document}
which gives as result
and actually the spacing is quite nice, I think.
I think the below code is nicer, and even gives better results.
\documentclass[10pt,a4paper]{article}
\usepackage{amsmath,amsthm,mathtools}
\begin{document}
\begin{proof}
\begin{align*}
15 &= 5+4+3+2+1 = \sum_{i=1}^5 i \\
120&=5\cdot4\cdot3\cdot2\cdot1 = 5! \\
\begin{gathered}
e^{\pi i} + 1 = 0 \\
x^n + y^n = z^n
\end{gathered}
27 &= 3^3 \qedhere
\end{align*}
\end{proof}
\end{document}
Credits go to barbara beeton (please vote up her comment on her own answer).
Best Answer
It has a pretty clear effect to me:
Can you provide a minimal working example where it doesn't?