#14108: bug in is_isomorphic with multiple edges
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Reporter: zimmerma | Owner: jason, ncohen, rlm
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.8
Component: graph theory | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Robert Miller | Merged in:
Dependencies: | Stopgaps:
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Changes (by ncohen):
* status: needs_review => needs_work
Comment:
That would be too easy `:-P`
It's not just a "local thing". That's really something that changes the
isomorphism test I fear.
{{{
sage: H=DiGraph([[0,0],[0,0],[0,0],[0,0],[0,0],[1,1],[1,1]])
sage: HH=DiGraph([[0,0],[0,0],[0,0],[0,0],[1,1],[1,1],[1,1]])
sage: H.is_isomorphic(HH)
True
}}}
Actually, I think that these two graphs should not be isomorphic. That's
the same problem, considering how multiple edges are translated into
labels.
{{{
sage: Graph([(0,1,1)]).is_isomorphic(Graph([(0,1,2)]))
True
}}}
Nathann
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14108#comment:11>
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