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View File Name : 1.tex~

\documentclass{article}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amsthm}

\newtheorem{proposition}{Proposition}

\begin{document}

\begin{proposition}
Any one-parameter semigroup $S_t$ of partial isometries is centered.
\end{proposition}

\begin{proof}
Write $P_t= 
\end{proof}

\end{document}
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