Labels in align / eqnarray environment?

[UlyssesZh]

\begin{align}
    a\nonumber\\
    \label{b}b\\
    \label{c}c
\end{align}

How to do this?

[lierdakil]

Long story short, you don't, but if you only need LaTeX/pdf output, you can just use LaTeX syntax. This is a duplicate of #131 so I'm closing it as such.