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Ramsey-type results on parameters related to domination

Combinatorics 2024-06-07 v2

Abstract

The following inequality chain ir(G)γ(G)i(G)α(G)Γ(G)I ⁣R(G) ir(G)\le \gamma(G)\le i(G)\le \alpha(G) \le \Gamma(G) \le I\!R(G) is known as a domination chain, where ir(G),γ(G),i(G),α(G),Γ(G)ir(G), \gamma(G), i(G), \alpha(G), \Gamma(G), and I ⁣R(G)I\!R(G) are the lower irredundance number, the domination number, the independence domination number, the independence number, the upper domination number and the upper irredundance number of GG, respectively. The Ramsey-type problem seeks to characterize the family H\mathcal H of graphs such that every H\mathcal H-free graph GG has a bounded parameter μ\mu. The classical Ramsey's theorem states that every {Kn,En}\{K_n, E_n\}-free graph has a bounded number of vertices. Furuya (Discrete Math.Theor 2018) characterized H\mathcal H such that every connected H\mathcal H-free graph GG has a bounded domination number. The characterization of the graph family H\mathcal H for which every connected H\mathcal H-free graph GG has a bounded independence number was due to Choi, Furuya, Kim, Park~(Discrete math. 2020) and Chiba, Furuya (Electron. J. Combin., 2022). In this paper, we further characterize H\mathcal H such that every connected H\mathcal H-free graph GG has bounded μ(G)\mu(G) for μ\mu belonging to the set {ir(G),i(G),Γ(G),IR(G)}\{ir(G), i(G), \Gamma(G), \text{IR}(G)\}. This completes the characterization of H\mathcal H for which every connected H\mathcal H-free graph GG has bounded μ(G)\mu(G) for μ(G)\mu(G) along the domination chain. Additionally, we characterize H\mathcal H such that every connected H\mathcal H-free graph GG has bounded μ(G)\mu(G) for μ\mu related to the domination number. Specifically, we consider the parameters O ⁣I ⁣R(G)O\!I\!R(G), I ⁣S(G)I\!S(G), or I ⁣R ⁣S(G)}I\!R\!S(G)\}, where O ⁣I ⁣R(G)O\!I\!R(G), I ⁣S(G)I\!S(G), and I ⁣R ⁣S(G)I\!R\!S(G) are the open irredundance number, the independence saturation number, and the irredundance saturation number of graph GG, respectively.

Keywords

Cite

@article{arxiv.2308.07667,
  title  = {Ramsey-type results on parameters related to domination},
  author = {Jin Sun and Xinmin Hou},
  journal= {arXiv preprint arXiv:2308.07667},
  year   = {2024}
}

Comments

13 pages, 1 figures,