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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- Last edited by David Roberts on 2019-04-30 17:00:41

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- 2019-04-30 17:00:41 by David Roberts (Reviewed)
- 2019-04-30 16:57:41 by David Roberts
- 2018-07-08 00:28:13 by Alina Bucur (Reviewed)

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