Created the Abstract Algebra theorems and definitions cheat sheet

part-2/chapters/chapter-11/the-fundamental-theorem.tex

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+\section{The Fundamental Theorem}
+
+\begin{theorem}[Fundamental Theorem of Finite Abelian Groups]
+	Every finite Abelian group is a direct product of cyclic groups of prime-power order. Moreover, the number of terms in the product and the orders of the cyclic groups are uniquely determined by the group.
+\end{theorem}