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I'm trying to create the attached image formulae. But I don't know how to get the double braces to work. This is my attempt with only single brace.

    x(t_n) = \left\{ \begin{array}{l l}
  0      &\quad \mbox{ $n<ns$ or $n>ne$} \\
  x(t_n) &\quad \mbox{ $ns\leq n\leq ne$}
\end{array} \right.

enter image description here

Could someone help me with the second brace? Thanks in advance

share|improve this question
This is easier to do with the cases environment than with array. Where did the image come from? – Charles Stewart Apr 8 '11 at 14:11
I did the image in equation editor in MS Word. – Dan Apr 8 '11 at 14:17
up vote 3 down vote accepted

I would try cases in amsmath.

    x(t_n) = \begin{cases}
        0 \\
    \xi(t_n) = \begin{cases}
        0      &n<ns, n>ne \\
        \xi(t_n) &ns\leq n\leq ne$
share|improve this answer
This didn't give the middle part of the image. – Dan Apr 8 '11 at 14:17
@Dan -- Oh, I just gave the cases example and thought you could do the rest. Sorry. I added the whole solution. – Richard Herron Apr 8 '11 at 14:25
Thanks so much! – Dan Apr 8 '11 at 14:44
\documentclass{minimal} \usepackage{amsmath}
\[ x(t_n) =\begin{cases} 0\\x(t_n)  \end{cases}\quad
\xi(t_n)=\begin{cases} 0 & \qquad\qquad (n<ns, n>ne) \\
\xi(t_n) & \qquad\qquad (n\leq n\leq ne) 
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