English

A bipartite version of the Erd\H{o}s $-$ McKay conjecture

Combinatorics 2022-11-09 v2

Abstract

An old conjecture of Erd\H{o}s and McKay states that if all homogeneous sets in an nn-vertex graph are of order O(logn)O(\log n) then the graph contains induced subgraphs of each size from {0,1,,Ω(n2)}\{0,1,\ldots, \Omega (n^2)\}. We prove a bipartite analogue of the conjecture: if all balanced homogeneous sets in an n×nn \times n bipartite graph are of order O(logn)O(\log n) then the graph contains induced subgraphs of each size from {0,1,,Ω(n2)}\{0,1,\ldots, \Omega (n^2)\}.

Keywords

Cite

@article{arxiv.2207.12874,
  title  = {A bipartite version of the Erd\H{o}s $-$ McKay conjecture},
  author = {Eoin Long and Laurentiu Ploscaru},
  journal= {arXiv preprint arXiv:2207.12874},
  year   = {2022}
}

Comments

17 pages, to appear in CPC