On the Ubiquity of Oriented Double Rays

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Autor/in:
Erscheinungsjahr:
2025
Medientyp:
Text
Beschreibung:
  • A digraph is called ubiquitous if every digraph that contains arbitrarily many vertex-disjoint copies of also contains infinitely many vertex-disjoint copies of . We study oriented double rays, that is, digraphs whose underlying undirected graphs are double rays. Calling a vertex of an oriented double ray a turn if it has in-degree or out-degree 2, we prove that an oriented double ray with at least one turn is ubiquitous if and only if it has a (finite) odd number of turns. It remains an open problem to determine whether the consistently oriented double ray is ubiquitous.
Lizenzen:
  • info:eu-repo/semantics/openAccess
  • http://creativecommons.org/licenses/by-nc-nd/4.0/
Quellsystem:
Forschungsinformationssystem der UHH

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Quelldatensatz
oai:www.edit.fis.uni-hamburg.de:publications/67f1fc35-2bda-409a-b38d-b3028680de98