%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-4-20 on page II-171 in "mathtools, interval --- Properly spaced intervals".
%%
%% 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{165.0pt}

%StartShownPreambleCommands

%StopShownPreambleCommands

\begin{document}
$  [a,e[ = [a,b] + ]b,c] + ]c,d[ - [d,e[ $
\end{document}