Question: (Gauss-Markov Theorem) Prove that XAX = X implies that XA is a projector onto Col(X), as we claimed in our proof of the Gauss Markov

(Gauss-Markov Theorem) Prove that XAX = X implies that XA is a projector onto Col(X), as we claimed in our proof of the Gauss Markov theorem (Theorem 7, p. 187) in

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