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I'm compiling a beamer presentation with the fourier font set, and the result shows a dot instead of the greek character \Omega. I have found that other people had the same problem here and here, but even after I put

\documentclass[xcolor={dvipsnames,table}, fleqn]{beamer}
\usefonttheme{professionalfonts}

I still get the dot. I tried to get a MWE and then I realized that when commenting the line

\usepackage{breqn}

which is used to break long equations, the problem was solved. Do you know what's causing this behavior? Can it be fixed so I can still use the breqn package?

MWE:

\documentclass{beamer}
\usefonttheme{professionalfonts}

\usepackage{fourier}
\usepackage{breqn} % break equations


\begin{document}
\begin{frame}
$\Omega$
\end{frame}
\end{document}
aaragon
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    Sorry to be blunt but from a 10 year user with 3k reputation I expect a MWE. I'll be happy to retract the downvote when the question is edited. – campa Nov 15 '23 at 11:56
  • https://tex.stackexchange.com/questions/667604/breqn-causes-tex-capacity-exceeded-when-using-neq-in-section-title#comment1659672_667604 – samcarter_is_at_topanswers.xyz Nov 15 '23 at 11:58
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    Even after puzzling together a compilable mwe from your information, it works fine. No dot anywhere – samcarter_is_at_topanswers.xyz Nov 15 '23 at 12:01
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    Similar: https://tex.stackexchange.com/q/686447/82917 https://tex.stackexchange.com/q/330012/82917 Long story short: breqn isn't compatible with fourier (or fouriernc). – campa Nov 15 '23 at 12:14
  • @campa I didn't add the MWE because it's shamefully simple—a user with an order of magnitude more reputation than me should have known... ;) – aaragon Nov 15 '23 at 12:39
  • No, it's not shamefully simple. Sometimes bad interactions are hidden in a particular loading order, and no rep difference enables me to read minds. Anyway thanks for the edit, downvote converted to upvote. – campa Nov 15 '23 at 12:44
  • @aaragon No, it is not shamefully simple, because a simple example works fine: ```\documentclass[xcolor={dvipsnames,table}, fleqn]{beamer}

    \usepackage{fourier} \usepackage{breqn}

    \begin{document}

    \begin{frame} [ \Omega ] \end{frame}

    \end{document}
    – samcarter_is_at_topanswers.xyz Nov 15 '23 at 12:47
  • Still my MWE doesn't, it seems the culprit is \usefonttheme{professionalfonts}. – aaragon Nov 15 '23 at 12:51
  • @aaragon ... and you said "even after I put..." which sounded as if you had the problem before you switched off beamer's font replacement. To avoid such confusing questions, you should always add a MWE, no matter how easy you think something is. – samcarter_is_at_topanswers.xyz Nov 15 '23 at 12:53
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    I'm not sure what's the purpose of doing “automatic” breaks in a presentation. – egreg Nov 15 '23 at 13:22

1 Answers1

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The best solution is to not use breqn, but it works fine if you don't disable beamer's font replacements:

\documentclass{beamer}
%\usefonttheme{professionalfonts}

\usepackage{fourier}
\usepackage{breqn} % break equations


\begin{document}
\begin{frame}
$\Omega$
\end{frame}
\end{document}

enter image description here

samcarter_is_at_topanswers.xyz
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