Latex: how to break a line inside $$

Question

I want to manually break a line inside $$:

$$something something <breakline> something else$$

I tried \\, \newline, and \linebreak but none work. Ideas?

Answer 1

A couple of people have suggested eqnarray which will work, but a better approach is the align environment in the amsmath package.

\begin{align*}
something \\
something else
\end{align*}

If you want the two parts aligned in some way, use an & as described in the amsmath documentation.