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the summation notation gives a degenerate result in a special case.For example, if in the definition above, then there is only one term in the sum; if , then there is none.

Algebraic sum

The phrase 'algebraic sum' refers to a sum of terms which may have positive or negative signs. Terms with positive signs are added, while terms with negative signs are subtracted.

History

The origin of the summation notation dates back to 1675 when Gottfried Wilhelm Leibniz,

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