Behzad–Chartrand–Wall conjecture for oriented digraphs
Behzad–Chartrand–Wall conjecture for oriented digraphs
Let be an -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 -vertex oriented digraph with minimum out-degree and minimum in-degree at least contains a directed triangle.
This is presented as a weakening of the 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.
Progress summary
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