37.51.0.1

\begin{equation} \label{more-morphisms-equation-proj-and-spec} \vcenter { \xymatrix{ \underline{\mathop{\mathrm{Spec}}}_ P \left( \bigoplus \nolimits _{m \in \mathbf{Z}} \mathcal{O}_ P(m) \right) \ar[r] \ar@{=}[d] & L = \underline{\mathop{\mathrm{Spec}}}_ P \left( \bigoplus \nolimits _{m \geq 0} \mathcal{O}_ P(m) \right) \ar[d]^\sigma \ar[r]_-\pi & P \ar[d] \\ U \ar[r] & X \ar[r] & Z } } \end{equation}

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