English

An oriented discrepancy version of Dirac's theorem

Combinatorics 2024-06-28 v2

Abstract

The study of graph discrepancy problems, initiated by Erd\H{o}s in the 1960s, has received renewed attention in recent years. In general, given a 22-edge-coloured graph GG, one is interested in embedding a copy of a graph HH in GG with large discrepancy (i.e. the copy of HH contains significantly more than half of its edges in one colour). Motivated by this line of research, Gishboliner, Krivelevich and Michaeli considered an oriented version of graph discrepancy for Hamilton cycles. In particular, they conjectured the following generalization of Dirac's theorem: if GG is an oriented graph on n3n\geq3 vertices with δ(G)n/2\delta(G)\geq n/2, then GG contains a Hamilton cycle with at least δ(G)\delta(G) edges pointing forward. In this paper, we present a full resolution to this conjecture.

Keywords

Cite

@article{arxiv.2211.06950,
  title  = {An oriented discrepancy version of Dirac's theorem},
  author = {Andrea Freschi and Allan Lo},
  journal= {arXiv preprint arXiv:2211.06950},
  year   = {2024}
}

Comments

11 pages, 1 figure

R2 v1 2026-06-28T05:45:26.885Z