English

Divisible subdivisions

Combinatorics 2021-06-30 v3

Abstract

We prove that for every graph HH of maximum degree at most 33 and for every positive integer qq there is a finite f=f(H,q)f=f(H,q) such that every KfK_f-minor contains a subdivision of HH in which every edge is replaced by a path whose length is divisible by qq. For the case of cycles we show that for f=O(qlogq)f=O(q \log q) every KfK_f-minor contains a cycle of length divisible by qq, and observe that this settles a recent problem of Friedman and the second author about cycles in (weakly) expanding graphs.

Keywords

Cite

@article{arxiv.2012.05112,
  title  = {Divisible subdivisions},
  author = {Noga Alon and Michael Krivelevich},
  journal= {arXiv preprint arXiv:2012.05112},
  year   = {2021}
}

Comments

Revised version, minor changes