%%
%% The LaTeX Companion, 3ed
%%
%% Example 12-3-17 on page II-245 in "Support for Times math".
%%
%% 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{141.0pt}
%StartShownPreambleCommands
\usepackage{newtxtext,newtxmath}
%StopShownPreambleCommands

\begin{document}
In running text: $ \sum \smallsum_{i=1}^n  \prod
                   \smallprod_x^y \smallcoprod\limits_z $!
\[ \overgroup{AB} \enspace \overgroupra{CDEF} \enspace
   \overgroupla{\ldots LMN\ldots} \enspace \widering{XYZ}
\]
\[ \undergroup{abc} \enspace \undergroupra{de} \enspace
   \undergroupla{\ldots xyz}
\]
\end{document}