breqnequationsline-breaking
I have this expression involving minimisation. How do I split it over two lines? The problem is \min seems to be separated from the objective function. breqn does not seem to work, as this is not an equation.
$$\min_{\substack{A,B,\\ 0\le A\le T \\ D+X+W-S\ge 0}}\bigg(I+X+W-E,-(X+k(A-B))\bigg)$$
Use either breqn to break lines automatically or use amsmath and its many environments exactly for this purpose. For example, with breqn:
\documentclass{article}
\usepackage{breqn}
\begin{document}
\begin{dmath}
Q(\lambda,\hat{\lambda}) = -\frac{1}{2} P{(O \mid \lambda )} \sum_s \sum_m \sum_t \gamma_m^{(s)} (t) \left( n \log(2 \pi ) + \log \left| C_m^{(s)} \right| + \left( \mathbf{o}_t - \hat{\mu}_m^{(s)} \right) ^T C_m^{(s)-1} \left(\mathbf{o}_t - \hat{\mu}_m^{(s)}\right) \right)
\end{dmath}
\end{document}
Note, the expression around \mid required braces to prevent it from breaking at this point; I'm sure there is a better way to do that; anyway, here's the output:
With amsmath, you need to specify the break points manually: (as others have also mentioned)
\usepackage{amsmath}
...
\begin{multline}
A+B+C+ \\ +D+E+F
\end{multline}
The users guide to amsmath is called amsldoc.pdf, but you can access it by typing texdoc amsmath on the command line. The main environments you'll use there would be align, split, and multline.
I'd use (memoir not relevant)
\documentclass[a4paper]{memoir}
\usepackage{amsmath}
\begin{document}
\begin{equation}
\begin{split}
\zeta_k(x) ={} & \frac{\sin (\frac{1}{2} (x - x_0)) \cdots
\sin(\frac{1}{2} (x-x_{k-1}))} { \sin ( \frac{1}{2} (x_k - x_0))
\cdots \sin(\frac{1}{2} (x_k - x_{k-1}))} %
%
\\
& \times \frac{\sin ( \frac{1}{2} (x - x_{k+1})) \cdots %
\sin(\frac{1}{2} (x - x_{2n}))}{\sin(\frac{1}{2} (x_k -
x_{k+1})) \cdots %
\sin(\frac{1}{2} (x_k - x_{2n}))}
\end{split}
\label{eq3}
\end{equation}
\end{document}
Best Answer
If you need to break up the conditions of the minimization problem across two or more lines, the following will work:
If you want the minimization conditions to be spread over just two lines, replace the first
\\with;\and you'd get:Addendum, posted after receiving a clarification from the OP: If, rather, the objective is to break up the argument of the minimization problem (I must confess I'd overlooked the comma in the earlier MWEs), the following should be of interest: