\documentclass[11pt]{amsart}
\usepackage{xypic,amsmath,amssymb}

\setlength{\parindent}{0pt}
%%%%%%% macros
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\newtheorem{proposition}{Proposition}[section]
\newtheorem{lemma}[proposition]{Lemma}
\newtheorem{corollary}[proposition]{Corollary}
\newtheorem{theorem}[proposition]{Theorem}

\theoremstyle{definition}
\newtheorem{definition}[proposition]{Definition}
\newtheorem{example}[proposition]{Example}
\newtheorem{examples}[proposition]{Examples}

\theoremstyle{remark}
\newtheorem{remark}[proposition]{Remark}
\newtheorem{remarks}[proposition]{Remarks}


\allowdisplaybreaks[4]






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\begin{document}
\title{Abstract Aspects of Higher Representation Theory} 

%%%%%Name%%%%%
\author{Name}

\maketitle

%%%%%Title of the talk%%%%%%
\begin{center}
\vspace*{2mm}
{\large \em Title}
\end{center}



Abstract:
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%put your abstract below:
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\end{document}