2

How is it possible to make a big right curly brace and have something like this in an equation array block?

enter image description here

My code doesn't work, can anyone find the problem? The left curly brace at the end of the array is small, not big.

$\begin{array}{l}
(\frac{1}{2} \pi_b+ \frac{1}{2}\pi_a) \pi_b+\\
\frac{1}{2} \pi_b(1-\pi_a-\pi_b) 
\end{array} \right. \left\} =\pi_b/2$
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  • mathtools has an rcases env for this purpose
    – daleif
    Commented Nov 19, 2015 at 9:20
  • place \left. before the array and \right\} after it
    – cgnieder
    Commented Nov 19, 2015 at 9:21

1 Answer 1

4

The \left. and \right\} instructions have to be placed outside the array environment.

\documentclass{article}
\begin{document}

\[ 
\left. \begin{array}{r} 
\frac{1}{2}( \pi_b+ \pi_a) \pi_b\\[1ex]
{}+\frac{1}{2} \pi_b(1-\pi_a-\pi_b)
\end{array} \right\} 
=\pi_b/2
\]

\end{document} 
0

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