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Ch12.pdf

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12 Graph Minors Our goal in this last chapter is a single theorem, one which dwarfs any other result in graph theory and may doubtless be counted among the deepest theorems that mathematics has to o↵er: in every infinite set of graphs there are two such that one is a minor of the other. This graph mi- nor theorem, inconspicuous though it may look at first glance, has made a fundamental impact both outside graph theory and within. Its proof, due to Neil Robertson and Paul Seymour, takes well over 500 pages. So we have to be modest: of the actual…

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