English

Awesome graph parameters

Combinatorics 2025-12-25 v2 Discrete Mathematics Data Structures and Algorithms

Abstract

For a graph GG, we denote by α(G)\alpha(G) the size of a maximum independent set and by ω(G)\omega(G) the size of a maximum clique in GG. Our paper lies on the edge of two lines of research, related to α\alpha and ω\omega, respectively. One of them studies α\alpha-variants of graph parameters, such as α\alpha-treewidth or α\alpha-degeneracy. The second line deals with graph classes where some parameters are bounded by a function of ω(G)\omega(G). A famous example of this type is the family of χ\chi-bounded classes, where the chromatic number χ(G)\chi(G) is bounded by a function of ω(G)\omega(G). A Ramsey-type argument implies that if the α\alpha-variant of a graph parameter ρ\rho is bounded by a constant in a class G\mathcal{G}, then ρ\rho is bounded by a function of ω\omega in G\mathcal{G}. If the reverse implication also holds, we say that ρ\rho is awesome. Otherwise, we say that ρ\rho is awful. In the present paper, we identify a number of awesome and awful graph parameters, derive some algorithmic applications of awesomeness, and propose a number of open problems related to these notions.

Keywords

Cite

@article{arxiv.2511.05285,
  title  = {Awesome graph parameters},
  author = {Kenny Bešter Štorgel and Clément Dallard and Vadim Lozin and Martin Milanič and Viktor Zamaraev},
  journal= {arXiv preprint arXiv:2511.05285},
  year   = {2025}
}
R2 v1 2026-07-01T07:26:12.369Z