#3404: Permutation groups .degree() function misleads.
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Reporter: jason | Owner: rlm
Type: defect | Status: closed
Priority: major | Milestone: sage-duplicate/invalid/wontfix
Component: basic arithmetic | Resolution: invalid
Keywords: |
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Changes (by mhansen):
* status: assigned => closed
* resolution: => invalid
* milestone: sage-4.0.1 => sage-duplicate/invalid/wontfix
Old description:
> Both of the graphs below are the path graph on 3 vertices. The problem
> is that the first labeling returns a permutation group of degree 2, when
> it should be of degree 3.
>
> {{{
> sage: g=Graph('Bo')
> sage: print g.automorphism_group().degree()
> 2
> sage: h=Graph('Bg')
> sage: print h.automorphism_group().degree()
> 3
> sage: g.is_isomorphic(h)
> True
> }}}
New description:
Both of the graphs below are the path graph on 3 vertices. The problem is
that the first labeling returns a permutation group of degree 2, when it
should be of degree 3.
{{{
sage: g=Graph('Bo')
sage: print g.automorphism_group().degree()
2
sage: h=Graph('Bg')
sage: print h.automorphism_group().degree()
3
sage: g.is_isomorphic(h)
True
}}}
--
Comment:
This has been fixed.
{{{
----------------------------------------------------------------------
| Sage Version 4.0.1.rc1, Release Date: 2009-06-04 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: sage: g=Graph('Bo')
sage: sage: print g.automorphism_group().degree()
3
sage: g.automorphism_group()
Permutation Group with generators [(1,2)]
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/3404#comment:3>
Sage <http://sagemath.org/>
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