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Using \dot{X} with beamer ends up with an x with an omega on it!! My code:

\documentclass[15pt, slidestop]{beamer}

\usepackage[T1]{fontenc} 
\usepackage[brazil]{babel}    
\usepackage[utf8]{inputenc}
\usepackage{ae}

\usepackage{pgf,xcolor,pgfarrows,pgfnodes,pgfautomata,pgfheaps,pgfshade}
\usepackage{graphicx}
\usepackage{amsmath,amssymb}
\usepackage{fancyvrb}
\usepackage[normalem]{ulem}
\usepackage{float}
\usepackage{colortbl}
\usepackage{bbm}   
\usepackage{color}
\usepackage{algorithmic}
\usepackage{rotating}
\usepackage{algorithm}
\usepackage{multicol}
\usepackage{fourier}

\begin{document}

\frame{
  \frametitle{}

\begin{displaymath}
\dot{x}  =  A x(t) + B u(t)
\end{displaymath}

}
\end{document}

Any help?

kiss my armpit
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    Your example works on my machine (i.e. I get a dot, not an omega). – Ian Thompson Sep 11 '12 at 13:22
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    Same on mine (Mac OS X Lion, TeX Live 2012). Could you pare down the list of packages to a minimal list that produces the error, and then say which version of each you are using (put \listfiles at the start of your document). – Andrew Stacey Sep 11 '12 at 13:23
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    Just a remark: package ae is rather old and should not be used today (see l2tabu). – Mensch Sep 11 '12 at 13:32
  • I am using Mac OS X Mountain Lion, Tex Live 2012.Darwin xxxxx.local 12.1.0 Darwin Kernel Version 12.1.0: Tue Aug 14 13:29:55 PDT 2012; root:xnu-2050.9.2~1/RELEASE_X86_64 x86_64 –  Sep 11 '12 at 13:35
  • I have ommited the \usepackage{fourier} in my initial posting. The problem is with this package! Sorry guys, and thank you very very much for your advices. –  Sep 11 '12 at 13:41
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    If you really want to use the Fourier fonts for your presentation, then add the professionalfont option to \documentclass. – egreg Sep 11 '12 at 13:55
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    @egreg: No! The class option is depreciated. The font theme is the correct way to invoke this (see http://tex.stackexchange.com/a/26829/86 for some details). – Andrew Stacey Sep 11 '12 at 14:16
  • @AndrewStacey Well, the manual says to use the option with fourier, see p. 194. – egreg Sep 11 '12 at 18:01

1 Answers1

9

Beamer does some stuff internally with fonts. If you load your own font package, you might want to switch that off. The font theme professionalfonts is provided for this functionality.

\documentclass{beamer}
\usefonttheme{professionalfonts}

\usepackage{fourier}

\begin{document}

\begin{displaymath}
\dot{x}  =  A x(t) + B u(t)
\end{displaymath}

\end{document}

Produces:

dot x with dot

Andrew Stacey
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