On Thu, 18 Jun 2009, Idris Samawi Hamid ادريس سماوي حامد wrote:

>> The easiest opiton is to use asana math, which is an otf math font based
>> on px fonts.
>> 
>> \starttypescript [math] [asana] [name]
>>     \definefontsynonym [MathRoman] [name:Asana-Math] 
>> [features=math\mathsizesuffix]
>> \stoptypescript
>> 
>> and then
>> 
>> \definetypeface [pagella_ar] [mm] [math]  [asana]       [default]
>
> LuaTeX warning (file 
> C:/ConTeXt/tex/texmf-project/fonts/data/asana/Asana-Math.otf): Type2 
> Charstring Parser: Unknown charstring operator: 0x00
>
> !LuaTeX error (file 
> C:/ConTeXt/tex/texmf-project/fonts/data/asana/Asana-Math.otf): Type2 
> Charstring Parser: Parsing charstring failed: (status=-1, stack=0)
> ==> Fatal error occurred, no output PDF file produced!
>
> Have any of you run into this before?

No. I am using the minimals from 2009.05.26, and asana math works fine. 
Are you using the latest version of the font from 
http://openfontlibrary.org/media/files/asyropoulos/219

> If this is a showstopper, then a fallback will have to do. Have any of you 
> made fallbacks for math fonts? Are there any subtleties compared to regular 
> fonts? What is the unicode slot for math \alpha?

Basic greek should work in math. I cannot get the latest minimals right 
now (slow internet connection), but px math and lm math use the same code 
to generate virtual fonts, so px math should work in the latest minimals.

Aditya