#18863: Subgroup doesn't work with number field unit group
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Reporter: katestange | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: group theory | Resolution:
Keywords: unit group, number field, | Merged in:
subgroup, gap | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by fwclarke):
I note that the same problem arises with class groups, which are also
built using `AbelianGroupWithValues`. However in the following case, it
''is'' possible to obtain a subgroup of a group with values:
{{{
sage: U = Zmod(30).unit_group()
sage: type(U)
<class
'sage.groups.abelian_gps.values.AbelianGroupWithValues_class_with_category'>
sage: U.subgroup([U.random_element()])
Multiplicative Abelian subgroup isomorphic to C2 generated by {f0*f1^2}
}}}
I have tried, but failed, to see why the other cases lead to `gap` errors.
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Ticket URL: <http://trac.sagemath.org/ticket/18863#comment:7>
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