Hi, An note about the math stuff wrt. luatex itself: there is no released beta yet, but current luatex trunk matches Hans' experimental version. It labels itself version 0.33.0, the revision is #1847, and it seems to be rather stable, despite massive math code changes. There are two big user-visible changes so far (this information is especially for Mojca & Aditya ). * I have added xetex-compatible primitives for the setting of math- and delcodes (and derivates). The names start with \U... instead of \XeTeX..., though. * Many of the math parameters are now separated out; some three dozen math parameters are definable in the eight math styles (\displaystyle, \textstyle, \scriptstyle, \scriptscriptstyle and \cramped versions thereof) using explicit TeX primitives or (easier, automatically) via loading of math fonts. Math fonts can now have a "MathConstants" lua subtable, this is simply the math data generated by fontforge, scaled to size. If this table is present in a font that is assigned to a math family slot, this data will be used instead of the traditional font parameters from \fam2 and \fam3. The manual is updated but not quite up to speed yet, I will fix that over the weekend (mostly explanations missing). Nothing new in OpenType MATH is really supported yet except these MathConstants (and Hans maps the traditional things like verticals extenders and italic corrections to their tfm equivalents), but there is definate progress. Still to do/planned (in planned/proposed implementation order): * Separate out the math spacing rules into parameters * Allow \mathchardef-ed control sequences in text mode * Support for automatic large operator size choosing * Full support for Math-Style extensibles (with overlaps) * Horizontal extensibles (\arrowfill, \bracefill) * Stetch Stacks (for \overbrace cs.) * Stacks (like \atop, but with more than two items) * One-click full font¶m switching (for \boldmath) * Prescripts * Flattened accents * Bottom accents * ?? (that list is open for discussion). Have fun, Taco