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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