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The narrow class group of a number field $K$ is the group of equivalence classes of ideals, given by the quotient of the multiplicative group of all fractional ideals of $K$ by the subgroup of principal fractional ideals which have a totally positive generator. It is a finite abelian group whose order is the narrow class number.

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• Review status: reviewed
• Last edited by David Roberts on 2019-04-30 17:00:41
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