Wednesday, 20 November 2019

quantum mechanics - Derivation of the Lippmann-Schwinger equation



I was trying to understand the derivation of the Lippmann-Schwinger equation in Sakurai's Modern Quantum Mechanics, Section 6.1. Our teacher presented a much simpler derivation, similar to that on Wikipedia. My question is:


What is the motivation for such a complicated derivation? Is it just to get around the inversion of the operator?




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