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How to make several lines of equations under one curly brace from the left side, such that it point to a reference number.

Now I do something like this:

\begin{align}
\left.
\begin{array}{ll}
a = b + c \\
& \dots  \\
a = b + c \\
& \dots  \\
a = b + c 
\end{array}
\right\} \label{formulas}\\
\end{align}

But equation number appears in the bottom of curly brace.

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except for the extra double backslash after the label, this is already addressed by earlier questions: Curly brace behind equations and How to right-side annotate a bracketed-together set of items in cases environment? –  barbara beeton Apr 7 '13 at 12:42
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2 Answers

up vote 9 down vote accepted

Looks like you have an extra line break \\ to the right of your label. If you delete it, the output should look fine.

sample output

\documentclass{article}

\usepackage{amsmath}

\begin{document}

\begin{align}
\left.
\begin{array}{ll}
a = b + c \\
& \dots  \\
a = b + c \\
& \dots  \\
a = b + c 
\end{array}
\right\} \label{formulas}
\end{align}

\end{document}
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2  
Side note: no point in using an align environment here; an equation would do. –  Jubobs Apr 6 '13 at 23:10
    
Thank, it was stupid mistake. Did not notice. –  msh Apr 6 '13 at 23:12
    
@Jubobs: You're right! Thanks for pointing out. I was trying to stick to OP's codes as close as possible, and didn't even think too much about the environment being used. –  Kevin C Apr 6 '13 at 23:15
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I would use rcases from the mathtools package for this- it loads and extends the amsmath package.

screenshot

Code

% arara: pdflatex
\documentclass{article}

\usepackage{mathtools}

\begin{document}

\begin{equation}
    \begin{rcases}
    a = b + c \\
      & \dots \\
    a = b + c \\
      & \dots \\
    a = b + c 
    \end{rcases}
    \label{formulas}
\end{equation}

\end{document}
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