Behzad–Chartrand–Wall conjecture for oriented digraphs

Let DD be an nn-vertex oriented digraph. Its minimum out-degree is the least number of outgoing neighbors of any vertex, and its minimum in-degree is the least number of incoming neighbors of any vertex. A directed triangle is a directed cycle of length three.

Behzad–Chartrand–Wall conjecture. Every nn-vertex oriented digraph with minimum out-degree and minimum in-degree at least n/3n/3 contains a directed triangle.

This is presented as a weakening of the r=n/3r=n/3 case of the Caccetta–Häggkvist conjecture. The source states that it remains open.

Sources & referencesView supporting material

Primary source

Hao Huang and Fei Peng, “An improved bound on Seymour's second neighborhood conjecture”, arXiv:2412.20234 (2024).

Additional references

4 papers in this index state this conjecture (2022–2024). The statement above is taken from the most recent of them; the others are arXiv:2401.14768, arXiv:2211.03129, arXiv:2207.05904.

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