diacritic marks in formulas

Question

I have the following code

\documentclass{report}
\usepackage{fontspec}
\begin{document}
Ārā
\begin{equation}
  \Phi_{Ārā}
\end{equation}
\end{document}

I use xelatex to compile this code containing Latvian characters - see Which inputenc for these Latvian letters?

The output is the following

The letters with diacritic marks are displayed correctly in text but are missing in the formula. How to fix?

This is a stupid bug/design flaw in TeX: when characters are missing in a font, it thinks it's something non-serious to hide in the log file. See Getting XeTeX to complain when a character is missing. IMO one should always put \tracinglostchars=2 at least. — ShreevatsaR, Jun 20 '17 at 15:05

score 7 · Answer 1 · edited Jun 20 '17 at 13:46

7

You probably don't want that text in math italic anyway. use the amsmath package and the \text command:

\documentclass{report}
\usepackage{fontspec}
\usepackage{amsmath}
\begin{document}
Ārā
\begin{equation}
  \Phi_{\text{Ārā}}
\end{equation}
\end{document}

edited Jun 20 '17 at 13:46

Au101

10,278

answered Jun 20 '17 at 13:44

Herb Schulz

3,410

score 6 · Accepted Answer · answered Jun 20 '17 at 13:44

You should use \mathrm or \text for this. But don't overuse diacritic in math, they can be confused with accents like \bar and so change the mathematical meaning.

\documentclass{report}
\usepackage{amsmath}
\usepackage{fontspec}
\begin{document}
Ārā
\begin{equation}
  \Phi_{\mathrm{Ārā}} \Phi_{\text{\normalfont Ārā}}
\end{equation}
\end{document}

diacritic marks in formulas

2 Answers2