On 07/12/2011 04:22 PM, Ulrike Fischer wrote: > > With xetex I can at least use > > \XeTeXmathcharnumdef\test=\XeTeXmathcodenum`\x > > but none of the various combination of \Umathchardef + \Umathcode > etc seems to work in luatex. NYI, see: http://tracker.luatex.org/view.php?id=620 Best wishes, Taco