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Problem
Problem
Show that the matrix
A
=
(
2
−
2
−
4
−
1
3
4
1
−
2
−
3
)
A=\begin{pmatrix}2&-2&-4\\-1&3&4\\1&-2&-3\end{pmatrix}
A
=
2
−
1
1
−
2
3
−
2
−
4
4
−
3
is idempotent.
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