#19328: Wrap automorphism group of groups better
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Reporter: kcrisman | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.9
Component: group theory | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by tmonteil:
Old description:
> See [http://math.stackexchange.com/questions/1458109/compute-
> automorphism-group-using-computer-software this math.SX question].
>
> {{{
> G = CyclicPermutationGroup(4)
> H = CyclicPermutationGroup(2)
> D=G.direct_product(H)
> D.AutomorphismGroup()
> <boom>
> }}}
> Okay, that's because you receive a tuple back. But
> {{{
> d = D[0]
> d.AutomorphismGroup()
> <boom for different and more annoying reason>
> }}}
> Also, there is no `gap()` method for such groups, only a `_gap_()`
> method, which most people will not know about.
New description:
See [http://math.stackexchange.com/questions/1458109/compute-automorphism-
group-using-computer-software this math.SX question] and
[http://ask.sagemath.org/question/29658/error-when-computing-automorphism-
group/ this ask question].
{{{
G = CyclicPermutationGroup(4)
H = CyclicPermutationGroup(2)
D=G.direct_product(H)
D.AutomorphismGroup()
<boom>
}}}
Okay, that's because you receive a tuple back. But
{{{
d = D[0]
d.AutomorphismGroup()
<boom for different and more annoying reason>
}}}
Also, there is no `gap()` method for such groups, only a `_gap_()` method,
which most people will not know about.
--
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Ticket URL: <http://trac.sagemath.org/ticket/19328#comment:1>
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