Why does the $\LaTeX$ cases environment not work?

Question

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?

Would you be so kind as to show how it's not working? That is, is it rendering incorrectly or just not at all? — Aarthi, Oct 10, 2012 at 23:14
It's rendering incorrectly. I can't get multiple lines even when I use \\ to separate them. — Peter Flom, Oct 10, 2012 at 23:18

Andy W · Accepted Answer · 2012-10-11 02:53:31Z

9

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*}

answered Oct 11, 2012 at 2:53

Andy W

15.6k22 silver badges34 bronze badges

$\begingroup$ Well, I don't know what I was doing wrong; clearly it does work. Thanks $\endgroup$
– Peter Flom
Oct 11, 2012 at 9:52
3

$\begingroup$ @PeterFlom see also meta.math.stackexchange.com/questions/5020/… which is full of goodies :) $\endgroup$
– TooTone
Mar 18, 2014 at 11:01

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