<p>Care to share an example, below taken from <a href="http://www.math.uiuc.edu/~hildebr/tex/displays.html" rel="nofollow">here</a> appears to be displaying correctly for me here on meta.</p>

<p>\begin{equation*}
|x|= 
\begin{cases} x &amp; \text{if $x≥0$,}
\\
-x &amp;\text{if $x\le 0$.}
\end{cases}
\end{equation*}</p>

<p>Code used to generate this:</p>

<pre><code>\begin{equation*}
    |x|= 
    \begin{cases} x &amp; \text{if $x≥0$,}
    \\
    -x &amp;\text{if $x\le 0$.}
    \end{cases}
    \end{equation*}
</code></pre>
