English

Canonical labelling of random regular graphs

Combinatorics 2026-02-20 v1 Discrete Mathematics Probability

Abstract

We prove that whenever d=d(n)d=d(n)\to\infty and ndn-d\to\infty as nn\to\infty, then with high probability for any non-trivial initial colouring, the colour refinement algorithm distinguishes all vertices of the random regular graph Gn,d\mathcal{G}_{n,d}. This, in particular, implies that with high probability Gn,d\mathcal{G}_{n,d} admits a canonical labelling computable in time O(min{nω,nd2+ndlogn})O(\min\{n^{\omega},nd^2+nd\log n\}), where ω<2.372\omega<2.372 is the matrix multiplication exponent.

Keywords

Cite

@article{arxiv.2602.17567,
  title  = {Canonical labelling of random regular graphs},
  author = {Mikhail Isaev and Tamás Makai and Brendan McKay and Pawel Pralat and Jane Tan and Maksim Zhukovskii},
  journal= {arXiv preprint arXiv:2602.17567},
  year   = {2026}
}
R2 v1 2026-07-01T10:43:13.993Z