I have a long equation that must fit in a two-column journal. I know how to break up the right-hand terms nicely, but even so it won't fit and I need the equal signs to start on a new line, but I can't figure out how to do it nicely.
Here is what I've tried:
\begin{align*}
p(\{K_{\text{pre}},\theta_{\text{b,pre}},\sigma_{\text{pre}},K_{\text{post}},\theta_{\text{b,post}},\sigma_{\text{post}}\}\mid D)\\
\begin{split}=\phantom{} & p(\{K_{\text{pre}},\theta_{\text{b,pre}},\sigma_{\text{pre}}\}\mid D)\\
& \times p(\{K_{\text{post}},\theta_{\text{b,post}},\sigma_{\text{post}}\}\mid D)
\end{split}
\\
\begin{split}=\phantom{} & p(\{K_{\text{pre}},\theta_{\text{b,pre}},\sigma_{\text{pre}}\}\mid D_{\text{pre}})\\
& \times p(\{K_{\text{post}},\theta_{\text{b,post}},\sigma_{\text{post}}\}\mid D_{\text{post}})
\end{split}
\end{align*}
and the result:
Ideally I guess the right-hand lines should be "moved" to the left, but I'm not sure how to do that. I've seen the answers to How can I split an equation over two lines but here the first equal sign must come on a new line.
&
beforep(\{K_{pre}.....)
– Michael Fraiman Jun 15 '17 at 7:43