Feynman parametrization

Feynman parametrization is a technique for evaluating loop integrals which arise from Feynman diagrams with one or more loops. However, it is sometimes useful in integration in areas of pure mathematics as well. It was introduced by Julian Schwinger and Richard Feynman in 1949 to perform calculations in quantum electrodynamics.

Hung Cheng and T.T. Wu proved in 1987 that the sum in the Dirac delta function can be reduced to a subset of Feynman parameters. This result is known as Cheng–Wu theorem.


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