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Definition

Summation Notation

The sum of the first nn terms of a sequence, whose nnth term is denoted as ana_n, can be written compactly using summation notation: i=1nai=a1+a2+a3++an\sum_{i=1}^n a_i = a_1 + a_2 + a_3 + \dots + a_n. In this expression, ii represents the index of summation, the lower limit 11 indicates where to start, and the upper limit nn indicates where to end the sum.

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Updated 2026-05-25

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Intermediate Algebra @ OpenStax

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