Nonexistence of universal graphs without some trees


IfG is a finite tree with a unique vertex of largest, and ≥4 degree which is adjacent to a leaf then there is no universal countableG-free graph.

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Research partially supported by the Hungarian Science Research Grant OTKA No. 2117 and by the European Communities (Cooperation in Science and Technology with Central and Eastern European Countries) contract number ERBCIPACT930113.

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Füredi, Z., Komjáth, P. Nonexistence of universal graphs without some trees. Combinatorica 17, 163–171 (1997).

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Mathematics Subject Classification (1991)

  • 05C10
  • 05C60
  • 05C05