%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-4-1 on page I-178 in "Change case of text intelligently (formerly textcase)".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{205.0pt}

%StartShownPreambleCommands
\usepackage{textcase}
%StopShownPreambleCommands

\begin{document}
\section{Textcase example}\label{exa}
\MakeTextUppercase{Text in section~\ref{exa},
  about $a=b$ and $\alpha \neq a$ }
\end{document}