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I use Times New Roman font for my report. But in the math expressions are not displayed Cyrillic characters.


  S_{ном.} = S_{123}


\documentclass[a4paper, 14pt]{extreport} 

\setmainfont{Times New Roman}



\newfontfamily\cyrillicfont{Times New Roman}

\usepackage{amssymb,amsfonts,amsmath,mathtext,cite,enumerate,float, mathtext} 
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up vote 5 down vote accepted

You should use

  S_\textup{ном.} = S_{123}

because that's text.

You can consider using unicode-math instead of mathtext

\setmainfont{Times New Roman}
\setmathfont{XITS Math}

% \newfontfamily\cyrillicfont{Times New Roman}

but notice that amsmath must be loaded before it. This wouldn't change the way you input that subscript.

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