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I am trying to break a long equation over multiple lines. It is here as follows:

\begin{equation}
\begin{split}
L(\textbf{q})=&\prod_{t=0}^{36}{q_{1}^{iB(t)sB(t+1)+iC(t)sC(t+1)}\\
&\quad\cdot q_{2}^{i(t)sA(t+1)+(iA(t)+iC(t))sB(t+1)+(iA(t)+iB(t))sC(t+1)}\\
&\quad\cdot(1-q_{2}^{i(t)})^{sA(t)-sA(t+1)}\\
&\quad\cdot(1-q_{1}^{iB(t)}q_{2}^{iA(t)+iC(t)})^{sB(t)-sB(t+1)}\\
&\quad\cdot(1-q_{1}^{iC(t)}q_{2}^{iA(t)+iB(t)})^{sC(t)-sC(t+1)}}
\end{split}
\end{equation}

But when I try and pdflatex the file, I get !Missing } inserted. And it doesn't run. I don't know why it's trying to put in extra brackets when they are not needed. And the file runs without the split environment (but I need to put it in since otherwise the equation flows off the page)

Any help??

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Remove first { in {q_{1}^{, first line and the last } in -sC(t+1)}} last line. –  Harish Kumar Mar 29 '13 at 13:15
    
Welcome to TeX.SX. A tip: If you indent lines by 4 spaces, then they're marked as a code sample. You can also highlight the code and click the "code" button ({}) or hit Ctrl+K. –  Claudio Fiandrino Mar 29 '13 at 13:29
    
You can make this much easier by replacing all the exponents with some simple notations and explain them separately. –  g.kov Mar 29 '13 at 14:27
2  
It's a common misconception to think that one has to write \prod_{i=1}^{n}{a_{i}}; while the braces for the limits are necessary, those around a_{i} aren't and actually shouldn't be used. –  egreg Mar 29 '13 at 14:41
    
Also, just so you know, it's best to use \mathbf{q} to get a bold upright q in math. For instance, if this equation was inside a theorem whose text was set in italic, the \textbf{q} would render as a bold italic q; but a \mathbf{q} would still render as a bold upright q. –  MSC Mar 29 '13 at 16:12

1 Answer 1

Here is a working version of your code. You don't need to wrap the product itself into {}. For real grouping I used curly braces.

Implementation

\documentclass{standalone}
\usepackage{amsmath}
\usepackage{bm}
\begin{document}
\begin{equation}
    \begin{split}
        L(\bm{q})
        &= \prod\limits_{t=0}^{36} \Bigl\{ q_{1}^{iB(t)sB(t+1)+iC(t)sC(t+1)} \\
        &\quad \cdot q_{2}^{i(t)sA(t+1)+(iA(t)+iC(t))sB(t+1)+(iA(t)+iB(t))sC(t+1)} \\
        &\quad \cdot (1-q_{2}^{i(t)})^{sA(t)-sA(t+1)} \\
        &\quad \cdot (1-q_{1}^{iB(t)}q_{2}^{iA(t)+iC(t)})^{sB(t)-sB(t+1)} \\
        &\quad \cdot (1-q_{1}^{iC(t)}q_{2}^{iA(t)+iB(t)})^{sC(t)-sC(t+1)} \Bigr\}
    \end{split}
\end{equation}
\end{document}

Output

img

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1  
I would align the subsequent factors under the first factor, not the \prod. –  mafp May 22 '13 at 10:26
    
I like your suggestion, but according to the question, this is what OP wanted. –  Henri Menke May 22 '13 at 16:24

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