English

Dense triangle-free $(n, d, \lambda)$-graphs for all orders

Combinatorics 2024-01-05 v1

Abstract

In 1994, Alon construct a triangle-free (n,d,λ)(n,d,\lambda)-graph with d=Ω(n2/3)d = \Omega(n^{2/3}) and λ=O(d1/2)\lambda = O(d^{1/2}) for an exponentially increasing sequence of integers nn. Using his ingenious construction, we deduce that there exist triangle-free (n,d,λ)(n,d,\lambda)-graphs with d=Ω(n2/3)d = \Omega(n^{2/3}) and λ=O((dlogn)1/2)\lambda = O( (d \log n)^{1/2} ) for all sufficiently large nn.

Cite

@article{arxiv.2401.02214,
  title  = {Dense triangle-free $(n, d, \lambda)$-graphs for all orders},
  author = {Jaehoon Kim and Hyunwoo Lee},
  journal= {arXiv preprint arXiv:2401.02214},
  year   = {2024}
}

Comments

9 pages

R2 v1 2026-06-28T14:08:35.826Z