58.13.0.1

\begin{equation} \label{pione-equation-inertia-diagram-pione} \vcenter { \xymatrix{ \pi _1(U^{sh}) \ar[r] \ar[rd]_1 & \pi _1(U^ h) \ar[d] \ar[r] & \pi _1(U) \ar[d] \\ & \pi _1(X^ h) \ar[r] & \pi _1(X) } } \end{equation}

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