[luatex] Use Math Glyphs from Text Font

[Will Robertson]

On 2010-10-06 18:52:02 +1030, "C. Comren" 
<ccomren at gmail.com> said:

> Thanks. With \mathit the Greek letters appear. However, if I modify
> the displayed math to
> 
> \[
>     \int \operatorname{vol} = \lambda
> \]
> 
> the integral does not appear and "vol" is not set in roman, but italic.

I'm afraid that unicode-math is designed primarily to replace the 
entire math system with Unicode. I'll attempt to make it play better 
with legacy TeX maths in the future, but for now you need to select a 
Unicode font for the maths you need to use. E.g., 
\setmathfont{xits-math.otf}

Sorry for the inconvenience,
Will