# Using body font in formulae

In Short: I can change the math font, but it is not working for numbers.

My document has a few formulae but only basic alphanumeric characters with very limited symbols (square root being the only particular character outside of the most common)

I have looked at the following questions:

And have gotten this far using the mathastext package (I'm on v1.3w):

I have made sure to load mathastext after fontspec.

But, while letters show as expected, numbers still have serifs.

Constraints:

• I am compiling with LuaLatex due to other packages in the mix

MWE:

\documentclass{article}
\usepackage{fontspec}
\setmainfont{RUBIK-REGULAR}[
Path=fonts/,
Extension=.ttf
]
\usepackage{mathastext}
\begin{document}
$T=2\sqrt{\frac{D}{A}}$
\center{Body Text}
\end{document}


You have to load fontspec with the no-math option.

\documentclass{article}
\usepackage[no-math]{fontspec}
%\setmainfont{RUBIK-REGULAR}[
%    Path=fonts/,
%    Extension=.ttf
%]
\setmainfont{Impact} % a random distinctive font on my system
\usepackage{mathastext}

\begin{document}

$T=2\sqrt{\frac{D}{A}}$

\begin{center}Body Text\end{center}

\end{document}


By the way, the command \center exists but

• it has no argument
• it should only be used implicitly via the center environment

• Thank you, this worked perfectly. The \center was just to create the sample image, I should have removed it from my MWE, apologies for any confusion it may have caused. – agryson Jul 1 '20 at 10:11

\usepackage[math-style=upright]{unicode-math}


And set the fonts to something like (if you’ve added a Rubik.fontspec file to your project directory):

\defaultfontfeatures{ Scale=MatchUppercase, Ligatures=TeX }
\setmainfont{Rubik}[Scale=1.0]
\setmathfont{Fira Math}
\setmathfont{Rubik}[range=up]


You can add to this any other characters the Rubik font contains, either with a hex code like "FF, a macro name, or a backtick literal. You can also do ranges, so if the font supports all of Latin-1, you could write range={up,"20-"FF}.

If the font you select does not have Greek letters, use instead:

\setmathfont{Rubik}[range=up/{Latin,latin,digits}]

• I have seen "fone" into your answer and after I have understood that the word is font 😄 – Sebastiano Jul 2 '20 at 12:12
• Nice, if I understand correctly, this would give me total granularity to have a specific character or set of characters in a specific font for formulae ? (That's much more than I need for this specific case but a nice tool to keep in the bag for later. - Thanks!) – agryson Jul 2 '20 at 20:37
• @agryson Yes. You can also apply any other transformation from fontspec, such as changing their color. – Davislor Jul 2 '20 at 20:41