10/03/10 18:43:13
>>773
\begin{align}
a &\underset{x \rightarrow y}{=} b \\
&\underset{\hphantom{x \rightarrow y}}{=} c
\end{align}
とか
10/03/10 18:43:13
>>773
\begin{align}
a &\underset{x \rightarrow y}{=} b \\
&\underset{\hphantom{x \rightarrow y}}{=} c
\end{align}
とか