The summation of a geometric series to infinity is equal to
a/1-rwhere a is equal to the first term and r is equal to the common difference between the terms.
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unit sample is defined by $(n)= 1 at n=0; = 0 otherwise; Used for to decompose the arbitrary signal x(n) into summation of weighted and shifted unit samples as follows x(n)=( summation of limit k=- infinite to + infinite) x(k)$(n-k)
It's not. It depends on the method you use for summation whether summation > integral or integral > summation.
An infinite series of points
1+x/1!+x^2/2!+.......x^n/n!
Sum or summation