36.20.0.2

\begin{equation} \label{perfect-equation-algebra-for-Pn} R = \mathop{\mathrm{Hom}}\nolimits _{\mathcal{O}_ X}(P, P) = \left( \begin{matrix} S_0
& S_1
& S_2
& \ldots
& \ldots
\\ 0
& S_0
& S_1
& \ldots
& \ldots
\\ 0
& 0
& S_0
& \ldots
& \ldots
\\ \ldots
& \ldots
& \ldots
& \ldots
& \ldots
\\ 0
& \ldots
& \ldots
& \ldots
& S_0
\end{matrix} \right) \end{equation}

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