English

Generalized Tur\'an problem with bounded matching number

Combinatorics 2025-05-22 v2

Abstract

For a graph TT and a set of graphs H\mathcal{H}, let \mboxex(n,T,H)\mbox{ex}(n,T,\mathcal{H}) denote the maximum number of copies of TT in an nn-vertex H\mathcal{H}-free graph. Recently, Alon and Frankl~(arXiv2210.15076) determined the exact value of \mboxex(n,K2,{Kk+1,Ms+1})\mbox{ex}(n,K_2,\{K_{k+1},M_{s+1}\}), where Kk+1K_{k+1} and Ms+1M_{s+1} are complete graph on k+1k+1 vertices and matching of size s+1s+1, respectively. Soon after, Gerbner~(arXiv2211.03272) continued the study by extending Kk+1K_{k+1} to general fixed graph HH. In this paper, we continue the study of the function \mboxex(n,T,{H,Ms+1})\mbox{ex}(n, T,\{H,M_{s+1}\}) when T=KrT=K_r for r3r\ge 3. We determine the exact value of \mboxex(n,Kr,{Kk+1,Ms+1})\mbox{ex}(n,K_r,\{K_{k+1},M_{s+1}\}) and give the value of \mboxex(n,Kr,{H,Ms+1})\mbox{ex}(n,K_r,\{H,M_{s+1}\}) for general HH with an error term O(1)O(1).

Keywords

Cite

@article{arxiv.2301.05625,
  title  = {Generalized Tur\'an problem with bounded matching number},
  author = {Yue Ma and Xinmin Hou},
  journal= {arXiv preprint arXiv:2301.05625},
  year   = {2025}
}

Comments

12 pages

R2 v1 2026-06-28T08:11:15.078Z