Let e; = [0, ...,0, 1,0, . .., 0], where 1 is the ith entry. Show (a) e;A = A¡, ith row of A. (c) If e;A = e;B, for each i, then A = B. (b) Be = B', jth column of B. (d) If Ae = Be , for each j, then A = B.

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