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I am writing a document in XeLaTeX using Libertine and Neo Euler as fonts:

\setmainfont{Linux Libertine G}
\setsansfont[Scale=MatchLowercase]{Liberation Sans}
\setmathfont[Scale=MatchLowercase]{Neo Euler}

Now when I use operators like \log or \cos, XeLaTeX typesets them with Neo Euler instead of Libertine (because of the option math-style=upright, required for Neo Euler). How can I keep Libertine, or set an other font (for example Liberation Sans, my sans serif font), as the font for operator names?

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up vote 2 down vote accepted

This seems to work (I don't have Linux Libertine G, though):

\setmainfont{Linux Libertine O}
\setsansfont[Scale=MatchLowercase]{Liberation Sans}
\setmathfont[Scale=MatchLowercase]{Neo Euler}
\setmathfont[Scale=MatchLowercase,range=\mathit]{Neo Euler}
\setmathfont[range=\mathup]{Linux Libertine O}
\setmathfont[range=\mathbfup]{Linux Libertine O Bold}
log $\log \mathrm{log}\mathbf{log}a+b\sum\int\alpha$

enter image description here

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Where is that alpha coming from? Libertine? – sujeet Apr 25 '14 at 6:01
@sujeet It's from Neo Euler – egreg Apr 25 '14 at 8:57
I think you will want to set partial=upright, nabla=upright – sujeet Apr 25 '14 at 15:01
@sujeet If one uses \partial, surely, because otherwise no symbol appears; I can see no difference with \nabla. – egreg Apr 25 '14 at 15:05

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