Question: 25. Let A be any mn matrix and define B by B A. (A'A) A' where (A'A) is any e-inverse of A'A. Show that ABAA;

25. Let A be any mn matrix and define B by B A¹.

(A'A) A' where (A'A) is any e-inverse of A'A. Show that ABAA; BABB; AB is symmetric.

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