Question: 19. Let A be an mxn given matrix, and let X be any nx m matrix such that A'AX = A' is satisfied, and let

19. Let A be an mxn given matrix, and let X be any nx m matrix such that A'AX = A'

is satisfied, and let Y be any n x m matrix such that YAA' = A'

is satisfied. Show that the g-inverse of A is given by A = YAX.

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