English

Bollob\'{a}s-Erd\H{o}s-Tuza conjecture for graphs with no induced $K_{s,t}$

Combinatorics 2024-07-25 v2

Abstract

A widely open conjecture proposed by Bollob\'as, Erd\H{o}s, and Tuza in the early 1990s states that for any nn-vertex graph GG, if the independence number α(G)=Ω(n)\alpha(G) = \Omega(n), then there is a subset TV(G)T \subseteq V(G) with T=o(n)|T| = o(n) such that TT intersects all maximum independent sets of GG. In this paper, we prove that this conjecture holds for graphs that do not contain an induced Ks,tK_{s,t} for fixed tst \ge s. Our proof leverages the probabilistic method at an appropriate juncture.

Keywords

Cite

@article{arxiv.2405.18264,
  title  = {Bollob\'{a}s-Erd\H{o}s-Tuza conjecture for graphs with no induced $K_{s,t}$},
  author = {Xinbu Cheng and Zixiang Xu},
  journal= {arXiv preprint arXiv:2405.18264},
  year   = {2024}
}

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5 pages