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## Main Question or Discussion Point

If O is a zero/null matrix with the dimension n*n, is O

How about if O is not a square matix (i.e. O has m*n dimension where m is not equal to n).

Thanks a lot...

^{0}defined as I_{n*n}???How about if O is not a square matix (i.e. O has m*n dimension where m is not equal to n).

Thanks a lot...