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## Homework Statement

I am having some difficulty with Jackson's notation.

I am coming from an engineering (not physics) background.

First of all, on Page 36 at the bottom of the page, Jackson uses the Dirac delta function d(x-x'). When he integrates his answer is the function at x instead of at x' as I would expect from the discussion on Page 26. Maybe this doesn't matter, but remember, you are talking to an engineer, so I need to understand the physical relevance.

My real question is, when Jackson starts working with Green's theorem, he uses x' as the location of his point charge in "Green Space" and as his integration variable. He then makes is integrals over d3x' and da'. Then he takes n' to be his normal vector and changes it to z' (n'=-z'). I understand why n=-z, but I don't understand the physical significance of the prime in this case. I still think that the prime refers to the location of the point charge in "Green Space".

## Homework Equations

See Above

## The Attempt at a Solution

This is in reference to problem 2.7 which I am working, but I am not asking for a solution. Just need help with the concept.

Thanks in advance