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:
If you'd like to learn more about summation, check out the Summation page at Learn Desmos:
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!
I want to sum only the odd numbers.
What about a lowercase sigma?
hi
Anyone know how to input "Infinity" into the calculator?
Type "infinity"
Any chance of Desmos actually working for infinite summations?
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.
What can the infinity symbol be used as an input?
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