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arxiv: 1305.1331 · v3 · pith:PLSM37VTnew · submitted 2013-05-06 · 🧮 math.CO

Immersions in highly edge connected graphs

classification 🧮 math.CO
keywords connectedcontainedgegraphsimmersionhighlystrongconsider
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We consider the problem of how much edge connectivity is necessary to force a graph G to contain a fixed graph H as an immersion. We show that if the maximum degree in H is D, then all the examples of D-edge connected graphs which do not contain H as a weak immersion must have a tree-like decomposition called a tree-cut decomposition of bounded width. If we consider strong immersions, then it is easy to see that there are arbitrarily highly edge connected graphs which do not contain a fixed clique K_t as a strong immersion. We give a structure theorem which roughly characterizes those highly edge connected graphs which do not contain K_t as a strong immersion.

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