Question: Show that the cross product terms formed from i
Show that the cross-product terms formed from (i· − ··), (·j − ··), and (ij − i· − ·j + X··) sum to zero, i = 1, 2, . . . a and j = 1, 2, . . . , b. For example, write
And sum each term in the inner summation, as grouped here, to get zero.
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