Math & Science ⇒ Remove vertical Space around aligned Equations

[ebjikki]

Hey there, please can someone help me out? I need to nest a couple of math environments. I give here a small example. I get too much blank space above and below the alignedat (equation 4), see also attachment.

Code: Select all

\documentclass[10pt]{article}
\usepackage{amsmath, nccmath}

\begin{document}
\begin{fleqn}[0pt]
\begin{alignat}{2}
  & a = b \\
  & c = d \\
  & e = f
\end{alignat}
  \begin{gather}
  \begin{alignedat}{2}
  & g = h \\
  & + i \\
  & + j
  \end{alignedat}
  \end{gather}
\begin{alignat}{2}
  & k = l \\
  & m = n
\end{alignat}
\end{fleqn}
\end{document}

Adding something like \\[-1em] doesn't work well, I seem never to fit the right measure. Your suggestions are appreciated! Thank you so much for helping.

[Stefan Kottwitz]

You could locally adjust the values \abovedisplayskip and \belowdisplayskip or even set them to 0 pt, within an environment or group.

Code: Select all

\documentclass[10pt]{article}
\usepackage{amsmath, nccmath}

\begin{document}
\begin{fleqn}[0pt]
\setlength{\abovedisplayskip}{0pt}
\setlength{\belowdisplayskip}{0pt}
\begin{alignat}{2}
  & a = b \\
  & c = d \\
  & e = f
\end{alignat}
  \begin{gather}
  \begin{alignedat}{2}
  & g = h \\
  & + i \\
  & + j
  \end{alignedat}
  \end{gather}
\begin{alignat}{2}
  & k = l \\
  & m = n
\end{alignat}
\end{fleqn}
\end{document}

Stefan