#17893: Incorrect decomposition returned by Graph.treewidth
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Reporter: ncohen | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.6
Component: graph theory | Keywords:
Merged in: | Authors: Nathann Cohen
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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As reported on asksage [1], the function `Graph.treewidth` can return
incorrect tree decompositions.
The computations are actually done right (the width returned is correct),
but my attempts to "simplify" the tree while it is being built
simplified.. a bit too much.
The way it is done now is a bit more correct, though a tad more ressource-
consuming. Nothing important, as the post-processing is infiinitely
cheaper than the actual solving anyway.
Nathann
[1] http://ask.sagemath.org/question/26011/treewidth/
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Ticket URL: <http://trac.sagemath.org/ticket/17893>
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