#15656: Sending groups to Gap renumbers permutation groups
----------------------------+----------------------------
Reporter: kcrisman | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: group theory | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Groups created from graph automorphisms start numbering at zero, but Gap
doesn't, so we get nasty behavior like this:
{{{
sage:
G1=Graph(':H`ECw@HGXGAGUG`e');G=G1.automorphism_group();sg=G.subgroups()
sage: G
Permutation Group with generators [(0,7)(1,4)(2,3)(6,8)]
sage: [s for s in sg]
[Permutation Group with generators [()],
Permutation Group with generators [(1,8)(2,5)(3,4)(7,9)]]
}}}
This originated at [https://groups.google.com/forum/#!topic/sage-
support/Lvft5VA7rFg this sage-support thread].
The root of the problem is
{{{
sage: G._gap_()
Group( [ (1,8)(2,5)(3,4)(7,9) ] )
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15656>
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