current theory, per michal, is that jsml is a mathjax predecessor and there is no use in continuing to support it. we could just drop it all from the sources.

cvr, wdyt?

thanks,
k

Error reported by Nasser M. Abbasi on TeX.SX [1]

This code:

\documentclass[]{article}%
\usepackage{amsmath}
\begin{document}
$\uparrow\sum F$
\end{document}

results in error

! Bad mathchar (79119). <argument> & \uparrow \sum F
l.8 \end{align}
?

with mathml output. As pointed out by Enrico Gregorio, this is caused by passing parameters \mathchar without terminating with space or \relax. This may cause weird behavior like in Nasser's example, when \sum F results in \mathchar"1350 F and because F is proper hexadecimal number it is added. Enrico proposed solution and I've made a patch for fixing this issue.

[1] http://tex.stackexchange.com/q/116340/2891