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In the last few days I have twice tried to use \cases in $\LaTeX$ and gotten nowhere. Why does it not work?

Or, if it does, how does it work?

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  • 4
    $\begingroup$ Would you be so kind as to show how it's not working? That is, is it rendering incorrectly or just not at all? $\endgroup$ – Aarthi Oct 10 '12 at 23:14
  • $\begingroup$ It's rendering incorrectly. I can't get multiple lines even when I use \\ to separate them. $\endgroup$ – Peter Flom Oct 10 '12 at 23:18
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Care to share an example, below taken from here appears to be displaying correctly for me here on meta.

\begin{equation*} |x|= \begin{cases} x & \text{if $x≥0$,} \\ -x &\text{if $x\le 0$.} \end{cases} \end{equation*}

Code used to generate this:

\begin{equation*}
    |x|= 
    \begin{cases} x & \text{if $x≥0$,}
    \\
    -x &\text{if $x\le 0$.}
    \end{cases}
    \end{equation*}
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