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\documentclass{amsart} \usepackage{amsmath,amssymb} \newcommand{\N}{\mathbb{N}} \DeclareMathOperator{\End}{End} \begin{document} In this lecture we'll study the ring of Endomorphisms of an Abelian group $A$. Let's denote this ring by $\End(A)$. Throughout the lecture, $\N$ will denote the set of natural numbers. \end{document}
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