English

Large induced trees in dense random graphs

Combinatorics 2020-04-07 v1

Abstract

Erd\H{o}s and Palka initiated the study of the maximal size of induced trees in random graphs in 1983. They proved that for every fixed 0<p<10<p<1 the size of a largest induced tree in Gn,pG_{n,p} is concentrated around 2logq(np)2\log_q (np) with high probability, where q=(1p)1q=(1-p)^{-1}. De la Vega showed concentration around the same value for p=C/np=C/n where CC is a large constant, and his proof also works for all larger pp. We show that for any given tree TT with bounded maximum degree and of size (2o(1))logq(np)(2-o(1))\log_q(np), Gn,pG_{n,p} contains an induced copy of TT with high probability for n1/2ln10/9np0.99n^{-1/2}\ln^{10/9}n\leq p\leq 0.99. This is asymptotically optimal.

Keywords

Cite

@article{arxiv.2004.02800,
  title  = {Large induced trees in dense random graphs},
  author = {Nemanja Draganić},
  journal= {arXiv preprint arXiv:2004.02800},
  year   = {2020}
}

Comments

12 pages

R2 v1 2026-06-23T14:41:24.800Z