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E(N) = 2*pi [tex]\int[/tex] (U(N) - U

_{exact})

^{2}r dr

Where E is the error for a specific N. Ultimately I have values for an approximation and exact values and want to do some sort of error analysis.

I haven't found any good resources for learning about this on the internet. Also if someone could recommend a good book that would be great.

Thanks in advance!