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→Exponentiation: Alternative notation for exponentiation. Tags: Mobile edit Mobile web edit |
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Line 256:
:<math>\prod_{i=1}^4 (i+1) = (1+1)\,(2+1)\,(3+1)\, (4+1),</math>
which results in
:<math>\prod_{i=1}^4 (i+1) = 120
In such a notation, the [[variable (mathematics)|variable]] {{mvar|i}} represents a varying [[integer]], called the multiplication index, that runs from the lower value {{math|1}} indicated in the subscript to the upper value {{math|4}} given by the superscript. The product is obtained by multiplying together all factors obtained by substituting the multiplication index for an integer between the lower and the upper values (the bounds included) in the expression that follows the product operator.
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