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Ray class groups and Hecke characters #15829

@pjbruin

Description

@pjbruin

Sage's support for ray class groups of number fields and Hecke characters is currently limited to NumberFieldFractionalIdeal.ray_class_number().

The purpose of this ticket is to implement ray class groups and Hecke characters using PARI's bnrinit0() and related functions.

CC: @sagetrac-ArgaezG @JohnCremona @loefflerd @slel

Component: number fields

Keywords: ray class group, pari, Hecke character, Sage Days 81, sd87

Author: Robert Harron

Branch/Commit: public/ticket/15829 @ d3b2b34

Issue created by migration from https://trac.sagemath.org/ticket/15829

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