There are common integrals in quantum field theory that appear repeatedly. These integrals are all variations and generalizations of gaussian integrals to the complex plane and to multiple dimensions. Other integrals can be approximated by versions of the gaussian integral. Fourier integrals are also considered.
Read more about Common Integrals In Quantum Field Theory: Gaussian Integrals in Higher Dimensions, Integrals That Can Be Approximated By The Method of Steepest Descent, Integrals That Can Be Approximated By The Method of Stationary Phase, See Also
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