sage: k4=graphs.CompleteGraph(4)
sage: k4.complement().line_graph().complement()
complement(): Graph on 0 vertices

clique_number() is crashing on the empty graph, 

On Saturday, December 1, 2012 9:30:27 AM UTC-5, Georgi Guninski wrote:
>
> for g in graphs(4): 
>  g.complement().line_graph().complement().clique_number() 
>
>
> cliquer file graph.c: line 31: assertion failed: (n>0) 
>
> Unhandled SIGABRT: An abort() occurred in Sage. 
> This probably occurred because a *compiled* component of Sage has a bug 
>
> On sagenb.org don't get any output, don't know how to interpret this. 
>
>

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