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I have a document where the main font is Gotham Book. So in my preamble I have:

\usepackage{fontspec}
\setmainfont{Gotham Book}

As the fontspec manual describes, this sets the math roman font to also be Gotham Book. But the math italic font remains from the Computer Modern family.

I know that \setmathrm will change the math roman font, and there are cousins \setmathtt, \setmathsf, and \setboldmathrm. But there's no \setmathit.

What am I missing?

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1  
It seems that mathspec is replaced by unicode-math. commands like \setmathrm are very limited. –  Leo Liu Feb 14 '11 at 13:55
1  
@Leo mathspec still has its place. unicode-math goes a little overboard with assuming that you actually have a unicode maths font. –  Will Robertson Feb 14 '11 at 14:31
    
Thank you, Will. –  Leo Liu Feb 14 '11 at 14:52
    
A plain LaTeX solution: The mathastext package. –  Seamus Feb 14 '11 at 16:47

2 Answers 2

up vote 10 down vote accepted

If you do not wish to otherwise change your maths symbols, the best solution is to use the mathspec package:

\documentclass{article}
\usepackage{mathspec}
\setallmainfonts(Digits,Latin){Georgia}
\begin{document}
Hello $a+\mathrm{b}=c$
\end{document}

Here, Georgia will be used for the body text and \mathrm, and Georgia Italic will be used for the italic math glyphs.

The unicode-math package (which I kinda wrote) can also do this, but it's somewhat overkill for your purposes and has the additional downside that you need to also load a Unicode mathematics font. Here's an example:

\documentclass{article}
\usepackage{unicode-math}
\setmainfont{Georgia}
\setmathfont{xits-math.otf}
\setmathfont[range=\mathit]{Georgia Italic}
\begin{document}
Hello $a+b=c$
\end{document}

Note that mathspec will not run (yet) on LuaTeX, so if you need a LuaLaTeX solution then you'll need to use unicode-math for now.

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Thanks, @Will. Do I not need \setmathrm as well? It seems like with my Gotham Book example where the main font is sans serifed it didn't change the operator font without it. –  Matthew Leingang Feb 14 '11 at 14:56
    
@Matthew Yes, \setmathrm is probably a good idea as well, but that's not what your original question at the top of the page asks :) –  Will Robertson Feb 14 '11 at 14:59
    
\setmainfont with fontspec was changing the math roman font automatically. I didn't mention it because it was doing the thing I wanted anyway, and I was not aware of mathspec. But \setmainfont with mathspec does not change the math roman font without an additional call to \setmathrm. –  Matthew Leingang Feb 14 '11 at 15:31

Thanks to Will and Leo for pointing out the mathspec package. So now I use:

\usepackage{mathspec} %loads fontspec as well
\setmainfont{Gotham Book}
\setmathrm{Gotham Book}
\setmathfont(Digits,Latin){Gotham Book}

This snippet may need optimization, but works.

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I was 19 seconds too slow :) –  Will Robertson Feb 14 '11 at 14:38

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