Created the Abstract Algebra theorems and definitions cheat sheet

part-5/chapters/chapter-27/classification-of-finite-plane-symmetry-gruops.tex

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+\section{Classification of Finite Plane Symmetry Groups}
+
+\begin{theorem}[Finite Symmetry Groups in the Plane]
+	The only finite plane symmetry groups are $\Z_n$ and $D_n$.
+\end{theorem}