 Lippmann–Schwinger equation

The Lippmann-Schwinger equation rewrites the Schrodinger differential equation as an integral equation using a free Green function and a prescribed incoming state.

The Lippmann–Schwinger equation is a fundamental equation in quantum mechanics that describes the scattering of particles. It is derived from the principles of quantum mechanics and is particularly useful in dealing with interactions in quantum systems. The equation can be expressed in two forms: the "in" and "out" formulations, corresponding to the incoming and outgoing states of the particles involved in scattering.