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 \begin{frame}{Inhomogeneous spherical space}
 
 	\begin{itemize}
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 		\item Manifolds of the form $\S^3/\Gamma$ with $\Gamma$ a group acting on $\S^3$.
 		\item \textcolor{red}{Multi-connected} space: it has non-contractable loops.
 		\item \textcolor{red}{Inhomogeneous} space: it does not look identical from every point in space.