The Hadwiger number of infinite vertex-transitive graphs

Combinatorica volume 12, pages481–491(1992)Cite this article

Abstract

We prove that every infinite, locally finite 3-connected, almost 4-connected, almost transitive, nonplanar graph, which contains infinitely many pairwise disjoint infinite paths belonging to the same end, can be contracted into an infinite complete graph. This implies that every infinite, locally finite, connected, nonplanar vertex-transitive graph with only one end can be contracted into an infinite complete graph. This problem was raised by L. Babai.

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Affiliations

  1. Mathematical Institute, The Technical University of Denmark, Building 303, DK-2800, Lyngby, Denmark

    Carsten Thomassen

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  1. Carsten Thomassen
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Thomassen, C. The Hadwiger number of infinite vertex-transitive graphs. Combinatorica 12, 481–491 (1992). https://doi.org/10.1007/BF01305240

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AMS subject classification code (1991)

  • 05 C 25
  • 05 C 40