In scattering theory, a part of mathematical physics, the Dyson series, formulated by Freeman Dyson, is a perturbative expansion of the time evolution operator in the interaction picture. Each term in the expansion can be represented by a sum of Feynman diagrams.
In scattering theory, a part of mathematical physics, the Dyson series, formulated by Freeman Dyson, is a perturbative expansion of the time evolution operator in the interaction picture. Each term in the expansion can be represented by a sum of Feynman diagrams.
Source: Wikipedia "Dyson series" · CC BY-SA 4.0
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