English

Paths with two blocks in oriented graphs of large minimum semi-degree

Combinatorics 2025-12-05 v1

Abstract

Stein (2020) conjectured that for any positive integer kk, every oriented graph of minimum semi-degree greater than k/2k/2 contains every oriented path of length kk. This conjecture is true for directed paths by a result from Jackson (JGT, 1981). In this paper, we establish the validity of Stein's conjecture specifically for any oriented path with two blocks, where, a block of an oriented path PP refers to a maximal directed subpath within PP.

Keywords

Cite

@article{arxiv.2512.04423,
  title  = {Paths with two blocks in oriented graphs of large minimum semi-degree},
  author = {Bin Chen and Xinmin Hou and Xinyu Zhou},
  journal= {arXiv preprint arXiv:2512.04423},
  year   = {2025}
}

Comments

13 pages,4figures

R2 v1 2026-07-01T08:08:48.641Z