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When I use beamer, things like \sin, \cos, etc. appear in the sans-serif font. But if I say

\DeclareMathOperator{\lcm}{lcm}

and then use \lcm inside a math formula, it appears in the cmr font. How can I get it to appear in the sans-serif font like other math functions?

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It doesn't happen to me; you should add the font loading part of your preamble. –  egreg Jun 30 '11 at 14:37

1 Answer 1

\documentclass{beamer}
\usepackage{amsmath}
\DeclareMathOperator{\lcm}{lcm}

\begin{document}
\begin{frame}{foo}{bar}

\[ \lcm = l\times c\times m \]

\end{frame}   
\end{document}

enter image description here

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