The **root number** of an Artin representation $\rho$,
also called the **sign**, is the constant $W(\rho)$ appearing in the
functional equation
of the associated L-function, i.e. the complex number $W(\rho)$ of absolute value $1$ such that $\Lambda(s,\rho)=W(\rho)\Lambda(1-s,\overline{\rho})$. It can be expressed as a product of local root numbers.

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- Review status: reviewed
- Last edited by David Farmer on 2012-06-28 08:57:15

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- 2012-06-28 08:57:15 by David Farmer (Reviewed)