# Summation

To use summation, you can find sigma in the Desmos keyboard (under FUNCTIONS and then misc) or by typing "sum":

If you populate the upper and lower bound, Desmos will output the summation answer.

You can also put a parameter for the upper and/or lower limits:

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• IAnthonyIsAwesome

Why can't I use a_n to represent a_0 at n=0 or any other n value?

Anthony, just use a function a(n) instead.

My problem is that Desmos seems to quit when computing a sum without telling me that it has quit!

Edit: Nevermind, I was just being sloppy: I defined the piecewise functions I was summing over with <'s instead of <='s!

• Tharun Dev V V

I want to sum only the odd numbers.

• Jmcinroy4813

• Welbaum Nathan

hi

• Noahrockyb

Anyone know how to input "Infinity" into the calculator?

• Shaun Errichiello

Type "infinity"

• Andrea Wahl

Any chance of Desmos actually working for infinite summations?

• Jeffrey Lu

For those of you who want only odd numbers, do the sum of 2n+1 for n=1 for as many numbers as you like.

• Flexagontnt

What can the infinity symbol be used as an input?