[texhax] Tex question - cases environment

[Axel E. Retif]

On  4 Mar, 2009, at 14:01, Angela Rademeyer wrote:

> \begin{equation*}
> a_{ig} =
> \begin{cases}
> 1 & \text{if customer $i$ belongs to profile group $g$}\\
> 0 & \text{otherwise}\\[.3cm]
> \end{cases}
> \end{equation*}

First, in your preamble,

\usepackage{amsmath}

then,

\begin{flalign*}
a_{ig} =
\begin{cases}
1 & \text{if customer $i$ belongs to profile group $g$}\\
0 & \text{otherwise} \\[.3cm]
\end{cases} && %% <------------------ these two &&
\end{flalign*}

If you use TeXLive 2008 or a recent MiKTeX, I think you should have  
Mathmode.pdf; in your terminal or command prompt,

texdoc mathmode

Best,

Axel