#15550: Implement the Kirchhoff-Symanzik polynomial for graphs
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Reporter: chapoton | Owner:
Type: enhancement | Status: needs_work
Priority: minor | Milestone: sage-6.1
Component: graph theory | Resolution:
Keywords: symanzik | Merged in:
polynomial | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: u/chapoton/15550 | 87702b4df58f7226297886d9fc505e8bec4e5cdc
Dependencies: | Stopgaps:
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Comment (by chapoton):
Hello Nathann,
thanks for the suggestion. But `is_forest` does not work correctly on
graphs with multiple edges:
{{{
sage: G=graphs.CycleGraph(6)
sage: G.is_forest()
False
sage: G.is_forest(certificate=True)
(False, [5, 4, 3, 2, 1, 0])
sage: G = Graph([(1,2,'a'),(1,2,'b')])
sage: G.is_forest(certificate=True)
sage: G.is_forest()
False
}}}
and moreover I need the cycle as a sequence of signed edges.
--
Ticket URL: <http://trac.sagemath.org/ticket/15550#comment:6>
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