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Reference.org
Common integrals in quantum field theory
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<p> Common integrals in quantum field theory are all variations and generalizations of <a href="/facts/Gaussian_integral/oLUdsmSt">Gaussian integrals</a> to the <a href="/facts/Complex_plane/vE0QrxJp">complex plane</a> and to multiple dimensions.: 13–15 Other integrals can be approximated by versions of the Gaussian integral. Fourier integrals are also considered. </p>