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I am writing a presentation using the beamer class and XeTeX. I have changed the sans font using \setsansfont. Now some symbols in my equations are rendered using the mono font (like the lowercase letters).

How can I force math mode to render all symbols in the equations in the default Computer Modern, ignoring the font set with \setsansfont?

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  • Could you pleas edit your question and add that you are seeing this behavior with beamer slides. That would be helpful for people having the same problem and searching for a solution.
    – Caramdir
    Feb 7, 2011 at 16:07
  • I changed the tags.
    – Leo Liu
    Feb 7, 2011 at 16:18

3 Answers 3

Reset to default
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By default, Beamer does some math font manipulation, because many fonts, such as the cm-sans used by default, don't provide matching mathematical glyphs. If you want the standard Computer Modern (serif) math font, just say 

\usefonttheme{professionalfonts}

in the preamble. This suppresses any auto-manipulations.

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  • Note that you don't have to (and in fact shouldn't) sign with your name since it automatically appears in the lower right corner of your post.
    – Hendrik Vogt
    Feb 8, 2011 at 16:19
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Yes, it was a beamer issue. Using

\documentclass[onlymath]{beamer}
\usefonttheme{serif}

solves the problem. Thanks for pointing me in the right direction, though.

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  • Yes. I didn't noitce it is beamer here.
    – Leo Liu
    Feb 7, 2011 at 16:01
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    And you'd use \usefonttheme[onlymath]{serif}.
    – Leo Liu
    Feb 7, 2011 at 16:12
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\usepackage[cm-default,no-math]{fontspec}
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    This change makes more symbols appear in the sans font, instead of the less, e.g. now numbers are in the sans font. Could this be a beamer issue?
    – Nickolay Kolev
    Feb 7, 2011 at 15:55

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