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\begin{document}

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\section*{conductor}

A conductor is a modulus (in the sense of number theory) associated to an abelian extension of number fields and reflects its ramification data. It has been introduced in the work of Weber at the end of 19th century. It is one of the central notions in [[class field theory]]. A later version is due [[Emil Artin]].

\begin{itemize}%
\item wikipedia \href{http://en.wikipedia.org/wiki/Conductor_%28class_field_theory%29}{conductor (class field theory)}, \href{http://en.wikipedia.org/wiki/Conductor-discriminant_formula}{conductor-discriminant formula}
\item Serge Lang, \emph{Algebraic number theory}, GTM 110, Springer 1970, 2000

\end{itemize}
[[!redirects conductors]]



\end{document}