I have to use iopart document class. One of major problems which I came across is aligning multiple equations. For example, for reach
\begin{align}
a & = b \label{eq1} \\
c & = d \label{eq2}
\end{align}
we must use either amsmath
package or other ones. Unfortunately, iopart does not coincide with it. In this situation how can I align my equations that have gotten me to stack?
\begin{eqnarray}...\end{eqnarray}