- tags
- Math, Series
- source
- https://www.khanacademy.org/math/ap-calculus-ab/ab-integration-new/ab-6-3/v/sigma-notation-sum

## Explaination

Summation is represented with a captial sigma. Under the sigma, we
add the starting value for the index, in our case `i=1`

. Over the
sigma, we add the end value. At the right of the sigma, we add the
value we’ll be summing in each *iteration* of the series.