Question: Let ???? be a solution of (4.39) with fixed ????. Show that: (a) if yi is replaced by yi + x i ????, then

Let ????

̂ be a solution of (4.39) with fixed ????. Show that:

(a) if yi is replaced by yi + x′

i

????, then ????

̂ + ???? is a solution

(b) if xi is replaced by Axi, then A′−1????

̂ is a solution.

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