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I write a textbook and I have completed 40 pages, but I don't like that the texts inside the $..$ are italic. For example

(x-3y) not like

(x-3y) I want

\documentclass{article}

\begin{document}

$(x-3y)$

\end{document}

What can I do to make the texts non-italic? Also, I don't want to change them all one by one.

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3
  • 7
    It is the maths tradition to have italic letters for variables, at least for lowercase letters (in some countries, the tradition is to have non-italic letters for uppercase and the greek alphabet).
    – Bernard
    Aug 2, 2020 at 17:44
  • Sir you are absolutely right, but the book is for children 10-15 years old. When I browse such books, I can't see italic letters. So I wanted to do something like this.
    – mathali
    Aug 2, 2020 at 17:48
  • 6
    The main problem is that those books are typeset with less powerful methods.
    – egreg
    Aug 2, 2020 at 18:29

2 Answers 2

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To globally change all math output to use upright lettering, for both latin and greek alphabet letters, I have the following suggestions:

  • If you use pdfLaTeX to compile your document, load the mathastext package with the option LGRgreek.

  • If you use either XeLaTeX or LuaLaTeX, load the unicode-math package and specify the option math-style=upright when you run the \setmathfont directive.

enter image description here

\documentclass{article}
\usepackage{iftex}
\ifpdftex
  \usepackage[LGRgreek]{mathastext}
\else
  \usepackage{unicode-math}
  \setmathfont{Latin Modern Math}[math-style=upright]
\fi

\begin{document}
$(x-3y)$ $\alpha\beta\gamma$ $ABC$
\end{document}
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1

Try just this $\rm (x-3y)$, hope it will work

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3
  • 1
    Thanks it worked, but What else can I do instead of changing all equations one by one?
    – mathali
    Aug 2, 2020 at 17:49
  • Probably it takes more efforts. Read this, please tex.stackexchange.com/questions/4155/…
    – Olga K
    Aug 2, 2020 at 17:55
  • 5
    \mathrm{...} it is the actual syntax instead of old notation \rm.
    – Sebastiano
    Aug 2, 2020 at 19:14

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