I just noticed that this question has some printing issues on the overview page that has to do with a \begin{cases} statement.
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$\begingroup$ Unless it has been changed, the reason is that the code for the preview grabs the first $n$ characters of the post. That of course provides ample opportunities to get broken MathJax code for the preview. $\endgroup$– Daniel Fischer ModCommented Feb 20, 2016 at 19:06
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$\begingroup$ @DanielFischer But the strange looking box shouldn't be desirable, I think. $\endgroup$– MartijnCommented Feb 20, 2016 at 19:09
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$\begingroup$ This seems related. I think we have a question about the excerpt preview with an answer, but I haven't found it yet. $\endgroup$– Daniel Fischer ModCommented Feb 20, 2016 at 19:11
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$\begingroup$ Also this, which links to this. These are about search results, but it's probably the same code. $\endgroup$– Daniel Fischer ModCommented Feb 20, 2016 at 19:16
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1 Answer
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Part of the problem is that MathJax syntax is chopped. This happens all the time, and usually results in completely non-rendered partial formula, which I think is the best we are going to have for a long time.
Another problem is that the text did have enough of a formula in it to render somewhat, resulting in an ugly box. This has to do with nested markup (and somewhat sloppy at that):
$f_{XY}(x,y) = \begin{cases}
2e^{-y} & \text{if $-y< x < y$ and 0 < y < } \infty .\\
0 & ...
I edited it to remove formula-text-formula nesting:
\text{if } -y< x < y \ \text{ and }\ 0 < y < \infty
Now the preview has plain unrendered formula, since there is no $ for MathJax to interpret as the closing delimiter.
Part of a problem is having symmetric delimiters $ ... $, which was not the best idea for TeX... Today one is advised to use \( \) in LaTeX documents but this doesn't work well here due to escaping and over-escaping.