Ore-type oriented Hamilton cycle discrepancy conjecture

Let DD be an oriented graph on n≥3n\ge 3 vertices with minimum degree δ\delta. For vertices u,vu,v, write d(u)d(u) and d(v)d(v) for their degrees, and call them non-adjacent if neither directed arc joins them. For an oriented Hamilton cycle CC, let σmax⁡(C)\sigma_{\max}(C) be the larger of its numbers of forward and backward arcs. Ore-type discrepancy conjecture. If

d(u)+d(v)≥nd(u)+d(v)\ge n

for each pair of non-adjacent vertices uu and vv, then there exists a Hamilton oriented cycle CC in DD such that

σmax⁡(C)≥max⁡{δ,n−δ}.\sigma_{\max}(C)\ge \max\{\delta,n-\delta\}.

This conjecture extends the cited Dirac-type result from a minimum-degree condition to an Ore-type condition. It is presented as open; the authors state that they could not prove it but provide supporting results, and the bound is sharp in the discussed cases.

References

Primary source

Jiangdong Ai, Qiwen Guo, Gregory Gutin, Yongxin Lan, Qi Shao, Anders Yeo and Yacong Zhou, “Oriented discrepancy of Hamilton cycles in oriented graphs satisfying Ore-type condition”, arXiv:2501.05968 (2026).

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