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It's about green's function in the book Messiah - Quantum Mechanics II - Chapter 16.3.2

(see http://books.google.de/books?id=OJ1...dq=messiah+quantenmechanik+kapitel+16.3&hl=de). The book actually is in german, but I guess that doesn't matter understanding the formulas.

I don't understand the last equality between eq. (16.60) & (16.61). Why is there in the first term's nominator a 1 (instead of "z - H_o - lV")? Can somebody help me out?

Cheers

Tobe

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# Problem understanding Green's function equality in Messiah QM II

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