#13808: Gromov hyperbolicity of graphs
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Reporter: dcoudert | Owner: jason, ncohen, rlm
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.6
Component: graph theory | Resolution:
Keywords: graph, hyperbolicity | Work issues:
Report Upstream: N/A | Reviewers:
Authors: David Coudert | Merged in:
Dependencies: | Stopgaps:
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Comment (by dcoudert):
Replying to [comment:2 ncohen]:
> Here is my current patch, and two comments :
>
> * It would be nice if ``sage -coverage hyperbolicity.pyx`` returned
"100% coverage". I hate to say it, because it often means adding useless
tests just to fit to the metrics `-_-`
OK, I will work on this.
> * What is the use of _reduce_biconnected_graph compared to goodcores ?
Useless, but since it is very fast (linear) it can be used for all
methods, while goodcores is only for cuts+.
> The docstring says that this function, by removing degree 2 vertices
whose neighborhood is an edge, would reduce a complete bipartite graph to
an edge... But no vertex of a complete bipartite graph is adjacent to two
adjacent vertices (a triangle). I do not see how (as the docstring says)
this function does anything different from the good core decomposition
method above.
Oups. We must add an edge to get many triangles.
> It would also be better to set this ticket to `need_work` until your
have found out where the bug you found comes from.
Sure.
> Tell me what you think of the changes I made ! They should make the html
doc nicer !
That's perfect. Thanks.
> Nathann
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13808#comment:3>
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