#14196: "subgroups" fails for C1 x C2
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Reporter: mstreng | Owner: malb
Type: defect | Status: new
Priority: major | Milestone: sage-5.8
Component: commutative algebra | Resolution:
Keywords: abelian group subgroups invfac one | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by mstreng):
In Sage 5.6, it was still:
{{{
sage: A = AbelianGroup([2,1])
sage: A
Multiplicative Abelian Group isomorphic to C2
sage: A.subgroups()
[Multiplicative Abelian Group isomorphic to C2, which is the subgroup of
Multiplicative Abelian Group isomorphic to C2
generated by [f], Trivial Abelian Group, which is the subgroup of
Multiplicative Abelian Group isomorphic to C2
generated by []]
sage: B = AbelianGroup([1,2])
sage: B
Multiplicative Abelian Group isomorphic to C2
sage: B.subgroups()
[Multiplicative Abelian Group isomorphic to C2, which is the subgroup of
Multiplicative Abelian Group isomorphic to C2
generated by [f], Trivial Abelian Group, which is the subgroup of
Multiplicative Abelian Group isomorphic to C2
generated by []]
}}}
I think the situation in Sage 5.7 is an improvement, except of course for
the failure to compute {{{B.subgroups()}}}.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14196#comment:1>
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