%% 
%%  Ein Beispiel der DANTE-Edition
%%  Mathematiksatz mit LaTeX
%%  3. Auflage
%%  Beispiel 06-09-2 auf Seite 111.
%%  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]{exaartplain}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\AtBeginDocument{\setlength\parindent{0pt}}
%StartShownPreambleCommands
\usepackage{newtxmath}% Lädt automatisch amsmath
\newcommand*\CurveArrowLeftRight{%
  \ensuremath{\mathaccent\curvearrowright{\mkern-6mu\curvearrowleft}}}
%StopShownPreambleCommands
\begin{document}
{ \huge $\curvearrowleft\curvearrowright\CurveArrowLeftRight$ }
        $\curvearrowleft\curvearrowright\CurveArrowLeftRight$
\footnotesize $\curvearrowleft\curvearrowright\CurveArrowLeftRight$
\end{document}