#15550: Implement the Kirchhoff-Symanzik polynomial for graphs
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Reporter: chapoton | Owner:
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-6.1
Component: graph theory | Resolution:
Keywords: symanzik | Merged in:
polynomial | Reviewers:
Authors: Frédéric Chapoton | Work issues:
Report Upstream: N/A | Commit:
Branch: u/chapoton/15550 | a3005a99f42302b4ae670d642cb719030f02a74d
Dependencies: | Stopgaps:
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Changes (by chapoton):
* status: needs_work => needs_review
Old description:
> This is a polynomial in several variables, useful in the study of Feynman
> diagrams.
>
> Done using a determinant (matrix-tree theorem)
>
> I had to use an auxiliary function.
New description:
This is a polynomial in several variables, useful in the study of Feynman
diagrams.
Done using a determinant (like in the matrix-tree theorem)
Also implements cycle_basis for graphs with multiple edges
and add an 'output' parameter to 'cycle_basis', 'is_tree' and 'is_forest'
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Comment:
Rewriting history again, here is a working version.
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Ticket URL: <http://trac.sagemath.org/ticket/15550#comment:30>
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