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Extremal function for rooted $K_5$ minors

Dvořák, Zdeněk
arXiv (OAI Expanded) · Papers
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combinatorics
We show that if an n-vertex 5-connected graph has at least 4n-10 edges, then for any choice of five of its vertices, we can contract disjoint connected subgraphs containing these vertices to obtain $K_5$ as a minor. The bound on the number of edges is the best possible.
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