# multline inside gather?

I have 3 related equations, two of them do not fit on a single line. I want to present them in a gather-environment, but how to do linebreaks inside equations? multline does not work inside gather.

In isolation, the equations would be typeset as follows:

$$eq 1$$

\begin{multline} long \\ eq 2 \end{multline}

\begin{multline} long \\ eq 3 \end{multline}

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do not use the equation environment, use align instead, then you can have linebreaks –  Herbert Dec 27 '10 at 11:49

The mathtools package has a multlined environment that relates to multline as aligned to align.
You can use split within gather.