# How to wrap a long equation in Latex

I have a very big equation and using split or multiline is not helping. How do i wrap it and how do i make sure thatRHS of the eqn is always on the right side of equal to ('=') even when line is changed

\begin{equation*}
\begin{split}
m_{12}(\{ \emph{Red},\emph{Blue} \})= K'* [m_{1}(\{ \emph{Red},\emph{Blue} \})*m_{2}(\{    \emph{Red},\emph{Blue} \})+m_{1}(\{ \emph{Red},\emph{Blue} \})*m_{2}(\{ \emph{Red},\emph{Blue},\emph{Green} \})+m_{2}(\{ \emph{Red},\emph{Blue} \})*m_{1}(\{ \emph{Red},\emph{Blue},\emph{Green} \})]
\end{split}
\end{equation*}


Use aligned:

\begin{equation*}
\begin{aligned}
m_{12}(\{ \emph{Red},\emph{Blue} \})
= K' * \bigl[ & m_{1}(\{ \emph{Red},\emph{Blue} \})*m_{2}(\{    \emph{Red},\emph{Blue} \}) \\
+ & m_{1}(\{ \emph{Red},\emph{Blue} \})*m_{2}(\{ \emph{Red},\emph{Blue},\emph{Green} \}) \\
+ & m_{2}(\{ \emph{Red},\emph{Blue} \})*m_{1}(\{ \emph{Red},\emph{Blue},\emph{Green} \})\bigr]
\end{aligned}
\end{equation*}

• I'd use \mathit rather than \emph – egreg May 3 '13 at 20:06
• @egreg The italic font is strange anyway, I just copied from the question. – Alex May 3 '13 at 20:08

Have you tried using the align environment?

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{align*}
m_{12}(\{Red,Blue\})&=K'*[m_1 (\{Red,Blue\})*m_2(\{Red,Blue\})\\

• using \mathit{Red,Blue} instead of just the words would result in a nicer appearance with respect to intra-word kerning. (the alignment is very nice, however.) – barbara beeton May 4 '13 at 13:11