No, the product is, but not the sum. 0 + 2 = 2
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zero + zero = zero
This means that the sum of the number and two is zero. So the number is -2.
Two is the minimum number of vectors that will sum to zero.
Zero is useful because if we did not have the number zero then if we did the sum 7-7 then there would be no answer because the answer is zero, zero replaces and odd bits in a sum or something......
Zero can be expressed as the sum of any two opposite mixed number.