If a number field $K$ is abelian, then $K\subseteq \Q(\zeta_n)$ for some positive integer $n$. The minimum such $n$ is the **conductor** of $K$.

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- Last edited by Alina Bucur on 2018-07-08 00:45:05

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- 2018-07-08 00:45:05 by Alina Bucur (Reviewed)