# Summation and Function Notation

**URL:** <https://cl.desmos.com/t/summation-and-function-notation/1653>\
**Category:** Questions\
**Created:** [October 7, 2020, 7:38pm UTC](https://cl.desmos.com/t/summation-and-function-notation/1653 "2020-10-07T19:38:24Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Elizabeth\_Houwen](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/elizabeth_houwen/32/565_2.png) [@Elizabeth\_Houwen](https://cl.desmos.com/u/Elizabeth_Houwen)\
**Post date:** [October 7, 2020, 7:38pm UTC](https://cl.desmos.com/t/summation-and-function-notation/1653/1 "2020-10-07T19:38:24Z")

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Is there a way I can define the function, f on the screen below so that when students type the summation into the math input it will be evaluated? I want to keep using function notation. I’d rather not have them type in the graph but that’s the only thing I know of right now.

 ![Screen Shot 2020-10-07 at 3.26.29 PM](https://canada1.discourse-cdn.com/flex031/uploads/desmos/original/2X/b/b44197825166941b22af23d5189e6a50ba1cc34e.png)