Ononot — What is the trace of \begin{pmatrix} 1 & 0 & 0 \\ 0 & 1 & 0

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What is the trace of $\begin{pmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{pmatrix}$ ?