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Viewing Preamble for ping-pong lemma
[
back to 'ping-pong lemma'
]
% almost certainly you want these
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amsthm}
\newtheorem*{theorem}{Theorem}
\newtheorem{fact}{Fact}
