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Line 1: '''Common integrals in quantum field theory''' are all variations and generalizations of [[Gaussian integral\|Gaussian integrals]] to the [[complex plane]] and to multiple dimensions.<ref>{{cite book\|author=A. Zee\|title=Quantum Field Theory in a Nutshell\|publisher=Princeton University\|year=2003\|isbn=0-691-01019-6}} pp. 13-15</ref> Other integrals can be approximated by versions of the Gaussian integral. Fourier integrals are also considered. ==Variations on a simple Gaussian integral==

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