Answer to Question #48690 in Matrix | Tensor Analysis for Sujata Roy

Question #48690

A is a m*n full rank matrix with m>n and I is an identity matrix. Let matrix A* = (A^T A)^-1 A^T. Then which of the following is FALSE?

a) AA* A = A
b) (AA*)^2 = AA*
c) A*A = I
d) AA* A = A*

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