example of trace

For the Matrix $ M,$

$\displaystyle M = \left( \begin{array}{ccc}
8 & 1 & 6 \\
3 & 5 & 7 \\
4 & 9 & 2 \end{array} \right)
$

the trace of $ M,$ $ tr(M)$ is

$\displaystyle tr(M) = 8 + 5 + 2 = 15
$



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