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Thanks localghost, my problem is exactly that described in the post you refer to. A MWE would be:


\begin{align}
x &= y \\
&\stackrel{\text{by Lemma 1}}{=} z
\end{align}


The solution in the other thread works ok, but is a bit tedious since I have to type in the width of columns manually ...

I have the same problem with a small twist: align doesn't work for me. I use eqnarray because it allows me to have one column aligned centrally, whereas align only seems to allow left- and right justified columns.

Specifically, I want to do the following:


\begin{eqnarray}
x &=& y+z ...