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could someone please explain to me what happens between (3.6) and (3.7). In specific, I don't understand how substitution results in l^2/pie^2 and also what do they mean integrating over radial angle. And the x next to the dx at (3.7), where did it come from.

http://aphyr.com/data/journals/113/comps.pdf

Thank you!

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# Could someone clear up the paper on casimir effect

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