"In their theory of superconductivity, Bardeen, Cooper, and Schrieffer made use of a reduced Hamiltonian which included only scattering of pairs of particles of opposite momentum and spin. It is shown that the solution they obtained by a variational method is correct to O(\tfrac{1}{n}) for a large system. The single particle Green's function is derived and used to calculate the interaction energy."
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John Bardeen and Gerald Rickayzen,
https://en.wikiquote.org/wiki/Hamiltonian_(quantum_mechanics)
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Hamiltonian (quantum mechanics)
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