More Ramsey theory for highly connected monochromatic subgraphs

Michael Hrušak, Saharon Shelah, Jing Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

An infinite graph is said to be highly connected if the induced subgraph on the complement of any set of vertices of smaller size is connected. We continue the study of weaker versions of Ramsey's theorem on uncountable cardinals asserting that if we color edges of the complete graph, we can find a large highly connected monochromatic subgraph. In particular, several questions of Bergfalk, Hrušak, and Shelah (2021, Acta Mathematica Hungarica 163, 309-322) are answered by showing that assuming the consistency of suitable large cardinals, the following are relatively consistent with ZFC: • for every regular cardinal, •. Building on a work of Lambie-Hanson (2023, Fundamenta Mathematicae. 260(2):181-197), we also show that • is consistent with. To prove these results, we use the existence of ideals with strong combinatorial properties after collapsing suitable large cardinals.

Original languageEnglish
Pages (from-to)2136-2150
Number of pages15
JournalCanadian Journal of Mathematics
Volume76
Issue number6
DOIs
StatePublished - 1 Dec 2024

Bibliographical note

Publisher Copyright:
© The Author(s), 2023.

Keywords

  • forcing
  • Highly connected graph
  • partition relations
  • saturated ideal

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