LaTeX-Paket amsmath
- http://tug.ctan.org/cgi-bin/ctanPackageInformation.py?id=amsmath
-
\documentclass[12pt,a4paper]{article}
\usepackage{amsmath}
\begin{document}
\begin{align}
a & = a\\
ab & = ab\\
abc & = abc
\end{align}
vs.
\begin{alignat}{2}
& & a & = a \\
& \iff & ab & = ab \\
& \iff & abc & = abc
\end{alignat}
\end{document}
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