Question: Write (r r') = (r r')(z z') and use direct integration to derive Weyls formula for the free-space Green function in three

Write δ(r − r') = δ(r⊥ − r'⊥)δ(z − z') and use direct integration to derive Weyl’s formula for the free-space Green function in three dimensions, Go(r, r') = 1 20 S dk__ik(r-r' ) __-k|z-z'l k (27)

Go(r, r') = 1 20 S dk__ik(r-r' ) __-k|z-z'l k (27)

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