(9) Which of a,b,c, and d is not equivalent to A (n by n) being invertible? If you think all are equivalent to A being invertible, pick e. (a) A has non-zero trace. (We define trace of a matrix to be the sum of the entries on the main diagonal.) (b) A has non-zero determinant. (c) A can be row reduced to the identity matrix. (Row reduce means applying ele mentary row operations) (d) A can be column reduced to the identity matrix. (Column reduce means applying elementary column operations, that is, row reduce in A.). (e) None of the above. TEA -- C

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