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Square of an infinite sum 
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#1
Feb2912, 11:25 PM

PF Gold
P: 1,957

Given a general, convergent infinite sum, say, one like this:
[tex]\sum_{n=0}^\infty a_n x^n[/tex] Is there a formula for the square of such a sum? I looked at the Cauchy product, but I'd rather not get a double sum as an answer... 


#2
Feb2912, 11:33 PM

HW Helper
Thanks
PF Gold
P: 7,715




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