A projection matrix is a square matrix P that satisfies P2 = P. (a) Prove that w
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(a) Prove that w ∈ mg P if and only if P w = w.
(b) Show that mg P and ker P are complementary subspaces, as defined in Exercise 2.2.24, so every v ∈ Rn can be uniquely written as v = w + z where w ∈ mg P, z ∈ ker P.
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