Question: 36. Let P = $$begin{bmatrix} P 1 P 2 end{bmatrix}$$, where P is orthogonal. Show that P 1 P 1 ' is idempotent.
36. Let P =
$$\begin{bmatrix}
P1 \\
P2
\end{bmatrix}$$, where P is orthogonal. Show that P1P1' is idempotent.
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