/sci/ - Science & Math

>>6729286
thanks for offering input, all i really need to know is how to handle the "N" variable in the summation sign. that is what is tripping me up.

The equation for energy is shown in the pic. It runs from negative inf to inf. Cool I get that. The power equation shown involves summing from n = -N to n = N. I do not know how to move forward because I don't understand plugging in a variable into another variable when trying to find out how it converges. I've googled all kinds of shit to find out how to do it. If you could point me in the right direction with a link or explain it im set for this assignment.