English

Ore's Theorem for rainbow Hamiltonian-connected graphs

Combinatorics 2025-12-16 v1

Abstract

Let G=(G1,G2,,Gm)G = (G_1, G_2, \ldots, G_m) be a collection of mm graphs on a common vertex set VV. For a graph HH with vertices in VV, we say that GG contains a rainbow HH if there is an injection c:E(H)[m]c: E(H) \to [m] such that for every edge eE(H)e \in E(H), we have eE(Gc(e))e \in E(G_{c(e)}). In this paper, we show that if G=(G1,,Gn)G = (G_1, \ldots, G_n) is a collection of graphs on nn vertices such that for every i[n]i \in [n], dGi(u)+dGi(v)nd_{G_i}(u) + d_{G_i}(v) \geq n whenever uvE(Gi)uv \notin E(G_i), then either GG contains rainbow Hamiltonian paths between every pair of vertices, or GG contains a rainbow Hamiltonian cycle. Moreover, we prove a stronger version in which we may also embed prescribed rainbow linear forests into the Hamiltonian paths.

Keywords

Cite

@article{arxiv.2512.12143,
  title  = {Ore's Theorem for rainbow Hamiltonian-connected graphs},
  author = {Yupei Li and Ruth Luo},
  journal= {arXiv preprint arXiv:2512.12143},
  year   = {2025}
}
R2 v1 2026-07-01T08:23:09.047Z