Incosistent fonts in siunitx and beamer - TeX

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Incosistent fonts in siunitx and beamer

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UdiB

Consider the following beamer file:

```
\documentclass{beamer}
\usepackage{fontspec}
\setsansfont{Arial}
\usefonttheme[onlymath]{serif}

\usepackage{siunitx}
\sisetup{%
input-digits = 0123456789\pi,per-mode = fraction,range-units = single,
}
\AtBeginDocument{\sisetup{unit-font-command = \mathrm}}
\usepackage{polyglossia}
\setdefaultlanguage[variant=american]{english}

\begin{document}
\begin{frame}{example}
$x=\mu$; A distance equal to \qty{100}{\um}.
\end{frame}
\end{document}
```

I want the equations and the units' symbols to be typed in serif font. That's why I do`\usefonttheme[onlymath]{serif}` and `\AtBeginDocument{\sisetup{unit-font-command = \mathrm}}`.

But I noticed that the `μ` in micro meter units is typed in the beamer main document font. How to fix it?

![Untitled.png](/image?hash=cbdbc0dca694e0abb4ed2ff2b9c67c7387a2da490f07c5fef931475aa1f91359)

Top Answer

samcarter

You redefine micro to e.g. use the upright μ from the `upgreek` package:

```
% !TeX TS-program = lualatex
\documentclass{beamer}
\usepackage{fontspec}
\setsansfont{Arial}
\usefonttheme[onlymath]{serif}

\usepackage{siunitx}
\sisetup{%
  input-digits = 0123456789\pi,
  per-mode = fraction,
  range-units = single,
}
\AtBeginDocument{\sisetup{unit-font-command = \mathrm}}

\usepackage{upgreek}
\DeclareSIPrefix{\micro}{\upmu}{-6}

\begin{document}
\begin{frame}  
\frametitle{example}
$x=\mu$; A distance equal to \qty{100}{\um}.
\end{frame}
\end{document}  
```

![document-1.png](/image?hash=4b99814a64bb32ccc8748e95a9381161228e146836e8444592ea7875e7d45eb6)

I recognise that in some fields mixing serif math and sans serif text is common in presentations, e.g. in theoretical physics. If you want to go this route, I would suggest to choose a serif font with a similar weight to the sans serif text. For example xcharter for serif would look much better than computer modern roman. ![](https://i.sstatic.net/KxzQU.png)

I've just had a very painful experience with font mixing: This year's Bavarian TeX user meeting took place last Saturday in Neu-Ulm. During the lunch break I went to see the new "Die Einsteins" museum in Ulm. In all their signage they had this terrible combination of sans serif font with handwritten year numbers: ![](https://www.donau3fm.de/storage/thumbs/1200x630c/r:1719486113/966775.jpg) This was so horrible to read!

@Joseph will probably know a cleaner solution, but as a quick hack, you could use either the normal math mu or the upright mu from the `upgreek` package: ``` % !TeX TS-program = lualatex \documentclass{beamer} \usefonttheme{professionalfonts} \usepackage{fontspec} \setsansfont{Arial} \usefonttheme[onlymath]{serif} \usepackage{siunitx} \sisetup{% input-digits = 0123456789\pi,per-mode = fraction,range-units = single, } \AtBeginDocument{\sisetup{unit-font-command = \mathrm}} \usepackage{polyglossia} \setdefaultlanguage[variant=american]{english} \usepackage{upgreek} \ExplSyntaxOn %\siunitx_declare_prefix:Nne \micro { -6 } { \mu }%math italic \siunitx_declare_prefix:Nne \micro { -6 } { \upmu }%upright \ExplSyntaxOff \begin{document} \begin{frame} \frametitle{example} $x=\mu$; A distance equal to \qty{100}{\um}. \end{frame} \end{document} ```

1 Answer