= Green's function (many-body theory)
{wiki=Green's_function_(many-body_theory)}
Green's functions are a powerful tool in many-body theory and quantum mechanics used to describe the behavior of quantum systems, particularly in the context of statistical mechanics and quantum field theory. They can provide important information about the dynamics and correlations of particles in a many-body system. \#\#\# Definition: A Green's function, in the context of quantum many-body theory, is typically defined as the time-ordered expectation value of a product of field operators.
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