# Equivalent of \mathup for upright text in math mode?

To insert text in mathmode, there are a couple of commands:

• \mathrm for Roman script,
• \mathbf for bold weight,
• \mathit for italic shape,
• \mathsf for the sans serif variant,

and so on. Now, sometimes I would like to have some math entities typeset upright (see for example How to best typeset "special" constants (complex unit i, Euler's number e,...)?). I understand that \mathrm sets the text in Roman and upright, but in some cases I do not want serifs (e.g., in presentations). The command \mathup does not seem to exist.

What is recommended way to set upright text in math mode?

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\mathsf? See this. – Jubobs Oct 20 '13 at 13:15
@Jubobs I would not want to have sanf serif script in a serif environment. I really only want to have \upshape. – Nico Schlömer Oct 21 '13 at 13:05
There is a definition of \mathup: Is \mathrm really preferable to \text? – Qrrbrbirlbel Oct 21 '13 at 13:14
@Thoge Quoting from tex.stackexchange.com/q/98008: "As has been said, \text is for text, and will change depending on the surrounding font. But math symbols in a document should always look the same: The meaning of a symbols also depends on the font used. So you should not use \text for mathematical symbols.". – Nico Schlömer Oct 23 '13 at 12:44
What about \newcommand{\mathup}[1]{\text{\textup{#1}}}? This works for me. – Wauzl Aug 7 '14 at 7:35

I guess what you are seeing is the following, when you use \mathrm with a serif font:

\documentclass{beamer}

\usepackage{amsmath}

\begin{document}

\begin{frame}
$$x y \mathrm{x} \text{\textup{x}}$$
\end{frame}

\end{document}


There are two ways to fix this: one fairly drastic option is to put

\renewcommand{\rmdefault}{cmss}


but this may feed through to places you are not expacting. An alternative is to replace the two relevant definitions from beamerbasefont.sty by

\AtBeginDocument{%
\SetMathAlphabet{\mathrm}{normal}{\encodingdefault}{cmss}{\mddefault}{n}
\SetMathAlphabet{\mathrm}{bold}{\encodingdefault}{cmss}{\bfdefault}{n}}


in your preamble. In the beamer style file cmss is \rmdefault.

On the above example, either method gives you:

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