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Sep 21, 2010 at 23:36 comment added Hans-Peter Stricker This sounds very promising. But if this was a real answer, why isn't my question a real question?
Sep 21, 2010 at 23:29 comment added Tony Huynh I'll just comment that I agree that this is what cycle structure of a graph means. Also, the theorem that David mentions was first proven by Whitney.
Sep 21, 2010 at 23:23 history answered David E Speyer CC BY-SA 2.5