Determine the typical (j kth) entry in A*A^T and the typical entry in A^T * A
Explain why it follows that if A*A^T or A^T * A is the zero matrix, then A = 0
Determine the typical (j kth) entry in A*A^T and the typical entry in A^T * A
Explain why it follows that if A*A^T or A^T * A is the zero matrix, then A = 0
Since we are able to multiple and then is square. If you look at the diagonal elements of say they are of the form