# multiple use of split

I have two equations that I would like to split (with a split command) but have them both lined up; i.e., something like

\begin{align}
\begin{split}
a&=xxxxxxxxxxxxx\\
&=xxxxxxxxxxxxxxx\label{1}
\intertext{and}
\begin{split}
b&=yyyyyyyyyyyyy\\
&=yyyyyyyyyyyyyyyy\label{2}
\end{split}
\end{align}


I want the split command so that the equation labels are centered between the two lines, and the align command so that all four equal signs are lined up. What I just tried doesn't work. I tried nesting aligned within align, but the four equal signs were not lined up.

• Please post a full minimal example that others can just copy'n'paste and try without having to add anything. Makes it a lot easier to help. – daleif Apr 25 '16 at 13:16
• Plus I do not quite get what you are trying to do. Note that split onlt handles a single & per line, if you need more, then use aligned (also not that the number of &'s per line is (2x number of alignments -1) ) – daleif Apr 25 '16 at 13:18
• BTW: if you remember to end the first split, then your sniplet works just fine – daleif Apr 25 '16 at 13:51

You're missing an \end{split} statement before \intertext.

\documentclass{article}
\usepackage{amsmath} % for "align" and "split" environments and "\intertext" macro
\begin{document}
\begin{align}
\begin{split}
a&=xxxxxxxxxxxxx\\
&=xxxxxxxxxxxxxxx\label{1}
\end{split}  % <--- new
\intertext{and}
\begin{split}
b&=yyyyyyyyyyyyy\\
&=yyyyyyyyyyyyyyyy\label{2}
\end{split}
\end{align}

\end{document}