abelianbnf
Résumé
abelianbnf is a gp script computing class groups of abelian fields using the methods described in the paper "Norm relations and computational problems in number fields" by Jean-François Biasse, Claus Fieker, Tommy Hofmann and Aurel Page, available at https://hal.inria.fr/hal-02497890
Requires Pari/gp, development version or stable version v2.13+.