> Alan Bowen <mailto:bowenalan03@gmail.com>
> 10. März 2016 um 15:34
> Assuming that it is possible, I have been trying to substitute the 
> Greek letters of my main font for those used in the math font. (if it 
> works, it should look better on the page than what I have now.)
>
> So, what have I missed/messed up in the following?
>
> \definefontfamily[mainface][serif][Brill][
> [protrusion=quality,
> expansion=quality,
> mode=node,
> force=yes,
> ]
>
> \definefallbackfamily[mainface][mm][TeX Gyre 
> Pagella][preset=math:digitsnormal,features=f:oldstyle]
>
> \definefallbackfamily[mainface][mm][Brill][range=0391-03A9,03B1-03C9]
You need braces around the list, i.e.

       
\definefallbackfamily[mainface][mm][Brill][range={0391-03A9,03B1-03C9}]

or

     
\definefallbackfamily[mainface][mm][Brill][range={lowercasegreeknormal,uppercasegreeknormal}]

Wolfgang