Math & Science ⇒ Derivatives in Beamer

[cgnieder]

This seems to be the same problem as the here: fontspec/mathspec ruins my parentheses with beamer. The solution outlined there works here as well:

Code: Select all

% arara: xelatex
\documentclass{beamer}

\AtBeginDocument{%
  \DeclareSymbolFont{pureletters}{T1}{lmss}{\mddefault}{it}%
  }

\begin{document}
\begin{frame}
\[
  f'(x).
\]
\end{frame}
\end{document}

AFAIK it is not a good idea to use fontenc with XeLaTeX.