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Viewing Preamble for polycyclic group

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\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}

\def\normal{\triangleleft}

% The below lines should work as the command
% \renewcommand{\bibname}{References}
% without creating havoc when rendering an entry in
% the page-image mode.
\makeatletter
\@ifundefined{bibname}{}{\renewcommand{\bibname}{References}}
\makeatother