Question: (Quadratic Forms)** Show that if P is an orthogonal projector then (a) the quadratic form $$z'Pz$$ is positive and (b) $$z'z ge z'Pz$$. 2.8.2 Extensions**

(Quadratic Forms)** Show that if P is an orthogonal projector then

(a) the quadratic form $$z'Pz$$ is positive and

(b) $$z'z \ge z'Pz$$.

2.8.2 Extensions**

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