- #1
feryee
- 9
- 0
what is the result for the following double summation:
##\sum\limits_{i \neq j}^{\infty}\alpha^i\alpha^j ##
where ## i, j =0,1,2,...##
##\sum\limits_{i \neq j}^{\infty}\alpha^i\alpha^j ##
where ## i, j =0,1,2,...##