#14502: Improvements of hyperbolicity procedures
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Reporter: dcoudert | Owner: jason, ncohen, rlm
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.10
Component: graph theory | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: David Coudert | Merged in:
Dependencies: | Stopgaps:
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Comment (by ncohen):
> Bloody hell, the Petersen!
It really is a counter-example to everything !
> The {{{__hyperbolicity__}}} method was implicitly assuming that
delta(G)>0 since graphs such that delta(G)=0 are tested before. But with
'dom' the situation may happen. I have added what is needed to prevent
such problem (also with cuts+).
>
> Should be better now.
Why do you add more code ? I don't get it. The fact that there is no
quadruple in the answer to Petersen's graph hyperbolicity is not a problem
as the lower bound is zero. The only problem is that the upper bound is 8
! You just had to test this case before returning the result, didn't you ?
Nathann
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14502#comment:17>
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