#14856: Bug in GenericGraph.vertex_connectivity when the digraph is a tournament
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Reporter: ncohen | Owner: jason, ncohen, rlm
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.12
Component: graph theory | Resolution:
Keywords: | Merged in:
Authors: Nathann Cohen | Reviewers: David Coudert
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by dcoudert):
In the test {{{(g.is_directed() and g.size() >= (g.order()-1*g.order())
and all(g.has_edge(u,v) for u in g for v in g if v != u)))}}} you should
add () around g.order()-1.
Furthermore, you should add the simple test I have proposed because it is
way faster for digraphs without loops or multiple edges.
So the test could be:
{{{
( g.is_directed() and g.size()>=(g.order()-1)*g.order() and
( (not g.allows_loops() and not g.allows_multiple_edges())
or all(g.has_edge(u,v) for u in g for v in g if v != u) ) )
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Ticket URL: <http://trac.sagemath.org/ticket/14856#comment:4>
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