On Fri, Mar 12, 2010 at 11:28 +0100, Sergio Llorente wrote:
> $$
> \begin{aligned}
> [z]=[y]
> \end{aligned}
> $$
> $[z]$ is missing!
The aligned environment accepts an optional argument. Here it thinks
your [z] is the argument. One solution would be to use
\begin{equation*}
\begin{aligned}\relax
[z]=[y]
\end{aligned}
\end{equation*}
(Concerning $$...$$ please see 'texdoc l2tabuen')
cheerio
ralf
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