Math Calculus
series n=1 to n=inf
4/(n^2 - 36)
what happens when n=6 and there is 0 in the denominator? do we just skip it?
The singularity at n = 6 makes the series undefined. If you replace the 36 by some arbitrary parameter, p^2, then you can exactly compute the summation in terms of p. The simplest way to compute the summation is by exploiting the fact that for p = integer, you'll have a singularity. The behaviour near each singularity can be easily evaluated. This then completely determines the summation.
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