Abstract
The derivation and interpretation of the many-particle Lippmann-Schwinger (NS) equation are reviewed. The derivation from the Schrödinger equation involves certain surface integrals at infinity, originally examined by Gerjuoy. Reasonable assumptions about the values of these surface integrals at real energies imply that the many-particle LS equation generally has nonunique solutions. Various arguments, including calculations in a model problem, indicate that these surface integrals have been correctly evaluated, despite recent claims to the contrary.
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