Hilton’s conjecture on cycle multiplicities
Version 1 / Nov 03, 2026 / CC BY 4.0
Abstract
We prove Hilton’s conjecture on the number of cycles of each length in dense Hamiltonian graphs. This resolves the problem posed by A. J.W. Hilton and recorded by Sheehan in 1977.
Provenance statement
References
- G. A. Dirac, Some theorems on abstract graphs , Proceedings of the London Mathematical Society (3) 2 (1952), 69--81. https://doi.org/10.1112/plms/s3-2.1.69.DOI
- J. A. Bondy, Pancyclic graphs I , Journal of Combinatorial Theory, Series B 11 (1971), 80--84. https://doi.org/10.1016/0095-8956(71)90016-5.DOI
- P. Erdős, On a theorem of Rademacher--Turán , Illinois Journal of Mathematics 6 (1962), 122--127. https://www.renyi.hu/~p_erdos/1962-09.pdf.link
- F. He and Z. Hu, A weakly pancyclic theorem for Hamiltonian non-bipartite graphs , Journal of Systems Science and Mathematical Sciences 28 (2008), 1288--1296. https://doi.org/10.12341/jssms10150.DOI
- J. Sheehan, Graphs with exactly one hamiltonian circuit , Journal of Graph Theory 1 (1977), 37--43. https://doi.org/10.1002/jgt.3190010110.DOI
- F. Nie, H. Ye, S. Liu, Z. Wang, S. Ermon and J. Zou, One-Sided Verification Under Limited Expert Review , arXiv:2610.18089 (2026). https://arxiv.org/abs/2610.18089.arXiv
- S. Liu, Rethlas-OSV: Desktop Math Agents for Mathematicians , 29 September 2026, updated 20 October 2026. https://srliu.com/blog/rethlas-osv-guide/.link
- C. Li, L. Xu and B. Zhou, The number of cycles of a given length in dense hamiltonian graphs: proving Hilton's conjecture , arXiv:2606.16114v1 (15 June 2026). https://arxiv.org/abs/2606.16114.arXiv
- S. Brandt, R. Faudree and W. Goddard, Weakly pancyclic graphs , Journal of Graph Theory 27 (1998), 141--176. Author manuscript: https://people.computing.clemson.edu/~goddard/papers/weakpanFinal.pdf.link
- S. Brandt, A sufficient condition for all short cycles , Discrete Applied Mathematics 79 (1997), 63--66. https://doi.org/10.1016/S0166-218X(97)00032-2.DOI
Show all 14 referencesShow fewer references
- P. Erdős and T. Gallai, On maximal paths and circuits of graphs , Acta Mathematica Academiae Scientiarum Hungaricae 10 (1959), 337--356. https://www.renyi.hu/~p_erdos/1959-10.pdf.link
- G. N. Kopylov, On maximal paths and cycles in a graph , Doklady Akademii Nauk SSSR 234 (1977), 19--21; English translation, Soviet Mathematics Doklady 18 (1977), 593--596. https://www.mathnet.ru/eng/dan40958.link
- Z. Füredi, A. Kostochka, R. Luo and J. Verstraëte, Stability in the Erdős--Gallai theorem on cycles and paths, II , arXiv:1704.02866 (2017). https://arxiv.org/pdf/1704.02866.arXiv
- R. Luo, The maximum number of cliques in graphs without long cycles , arXiv:1701.07472v2 (2017). https://arxiv.org/pdf/1701.07472.arXiv
Version history
- v1 · 9 pagesSubmitted by Qiyue TangInitial depositCurrentNov 02, 2026