[pdftex] foreign letter in text

[David Carlisle]

On 02/07/2024 18:30, Aleks Kleyn wrote:
\documentclass{amsbook}
\usepackage{cmap}
\usepackage[T2A,T2B]{fontenc}
\usepackage[english,russian]{babel}
\selectlanguage{russian}

\begin{document}
\renewcommand\chaptername{Дневник поиска}%
\chapter{Булеановы алгебры}
\section{Порождённые отображения}
text
\end{document}


It's a bug in the class, it should never apply \uppercase to user input as it will break the encoding support.

If you patch it to use \MakeUppercase you get


[cid:part1.M8VQsQqQ.W4Ksm4E8 at nag.co.uk]



\documentclass{amsbook}

\usepackage{etoolbox}
\makeatletter
\patchcmd\@makechapterhead{\uppercase\@xp}{\MakeUppercase}
                      {\typeout{patched}}{\typeout{notpatched}}
\makeatother
\usepackage[T2A,T2B]{fontenc}

\usepackage[english,russian]{babel}

\selectlanguage{russian}



\begin{document}

\renewcommand\chaptername{Дневник поиска}%

\chapter{Булеановы алгебры}

\section{Порождённые отображения}

text

\end{document}



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