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The sign of the functional equation of an analytic L-function, also called the root number, is the complex number $\varepsilon$ that appears in the functional equation of $\Lambda(s)=\varepsilon \overline{\Lambda}(1-s)$. The sign appears as the 4th entry in the quadruple known as the Selberg data.

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• Last edited by Andrew Sutherland on 2018-09-30 10:15:57
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