English

Tur\'an number of an induced complete bipartite graph plus an odd cycle

Combinatorics 2019-03-27 v1

Abstract

Let k2k \ge 2 be an integer. We show that if s=2s = 2 and t2t \ge 2, or s=t=3s = t = 3, then the maximum possible number of edges in a C2k+1C_{2k+1}-free graph containing no induced copy of Ks,tK_{s,t} is asymptotically equal to (ts+1)1/s(n2)21/s(t - s + 1)^{1/s}\left(\frac{n}{2}\right)^{2-1/s} except when k=s=t=2k = s = t = 2. This strengthens a result of Allen, Keevash, Sudakov and Verstra\"{e}te and answers a question of Loh, Tait and Timmons.

Keywords

Cite

@article{arxiv.1707.06482,
  title  = {Tur\'an number of an induced complete bipartite graph plus an odd cycle},
  author = {Beka Ergemlidze and Ervin Győri and Abhishek Methuku},
  journal= {arXiv preprint arXiv:1707.06482},
  year   = {2019}
}