Question: 20. For the system X'XB = X'y in Sec. 7.5, prove that G is unique for any solution if and only if the column

20. For the system X'XB = X'y in Sec. 7.5, prove that Gẞ is unique for any solution

ẞ if and only if the column space of G' is a subspace of the column space of X'.

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