David Perkinson wrote:
> sage: g = Graph()
> sage: 
> g.add_edges([(0,1,1),(0,2,1),(0,3,1),(0,4,1),(0,5,1),(1,2,1),(2,3,1),(3,4,1),(4,5,1)])
> sage: g.tutte_polynomial().subs(x=1,y=1)
> 66
> sage: Matroid(g).tutte_polynomial().subs(x=1,y=1)
> 55
> 
> sage: f = Graph()
> sage: f.add_edges([(0,1),(0,2),(0,3),(0,4),(0,5),(1,2),(2,3),(3,4),(4,5)])
> sage: f.tutte_polynomial().subs(x=1,y=1)
> 55
> sage: Matroid(f).tutte_polynomial().subs(x=1,y=1)
> 55

Fixed in Sage 6.7.beta5 (#18366).


-leif


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