The bowtie three-in-or-three-out conjecture
Let be the bowtie graph, with a distinguished center vertex, and let be an orientation of having exactly three edges directed toward the center vertex or exactly three edges directed away from it. The bowtie three-in-or-three-out conjecture. Then
This is the remaining unresolved orientation case after the other bowtie orientations were shown to have more than orientations; whether the displayed equality holds remains open.
References
Primary source
Hannah Sheats, “Orientations of graphs omitting non-edge-critical directed graphs”, arXiv:2502.21287 (2025).
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