%%
%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 04-13-2 auf Seite 67.
%%  Copyright (C) 2018 Herbert Voss
%%
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%%  See http://www.latex-project.org/lppl.txt for details.
%%
%% ====
% Show page(s) 1
%%
%%
\documentclass[10pt]{screxa}
\pagestyle{empty}
\setlength\textwidth{98.40707pt}
\AtBeginDocument{\setlength\parindent{0pt}}
%StartShownPreambleCommands
\makeatletter
\newcommand*\foo{\mathop{\operator@font foo}\nolimits}
\newcommand*\baz{\mathop{\operator@font baz}}
\makeatother
%StopShownPreambleCommands
\begin{document}
\[ \foo_1^2 = \baz_1^2 = \foo\limits_1^2 \]
\end{document}