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The complex functions $\Gamma_\R(s) := \pi^{-s/2}\Gamma(s/2)\qquad\text{and}\qquad \Gamma_\C(s):= 2(2\pi)^{-s}\Gamma(s)$ that appear in the functional equation of an L-function are known as gamma factors. Here $\Gamma(s):=\int_0^\infty e^{-t}t^{s-1}dt$ is Euler's gamma function.

The gamma factors can also be viewed as “missing” factors of the Euler product of an L-function corresponding to (real or complex) archimedean places.

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• Review status: reviewed
• Last edited by Andrew Sutherland on 2019-06-05 16:37:58
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