From 2-b, consider a new vector field A'(x) = \mu_0 / 4 \pi \int j(y) / |x| d^3 y.
if you accept these definition, then we can write that A(x) = A'(x-y).
using this, you can make a Taylor expansion of A(x) = A'(x-y).
PS. there was a homework problem using exactly the same method to this.
go back to HW #3 problem 5-b.
i think you must learn some lesson from this.
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homework6에서 2-b가 이상한 것 같아요. Taylor expanding을 할 때, center of Taylor expanding이 없는데도 가능한가요? 그리고 만약 center of Taylor expanding을 임의로 잡고서 한다고 해도, 그 차이는 어떻게 처리를 해야되나요? 예를 들면, 만약 center를 X_0로 한다면, X-X_0 term은 어떻게 해야 되는지요?
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