Hamilton-cycle reconstruction conjecture from induced subgraphs

For a graph GG, let [?][?] denote the multiset of its induced subgraphs on [?][?] vertices. There are constants 0c<10\leq c<1 and n00n_0\geq 0 such that, for every integer nn0n\geq n_0, the number of Hamilton cycles of every nn-vertex graph GG is uniquely determined by the multiset of induced subgraphs of GG on cn\lfloor cn\rfloor vertices.

Hamilton-cycle reconstruction conjecture. There are constants 0c<10\leq c<1 and n00n_0\geq 0 such that, for all integers nn0n\geq n_0, the number of Hamilton cycles of an nn-vertex graph GG is uniquely determined from C(G,cn)\mathcal{C}(G,\lfloor cn\rfloor).

The conjecture proposes that Hamilton-cycle counts, despite involving connected spanning structures, can be reconstructed from induced subgraphs of a fixed linear-size fraction strictly smaller than the full graph. The supplied text gives no resolution, so the conjecture is treated as open.

Sources & referencesView supporting material

Primary source

Donggyu Kim and Hyunwoo Lee, “Reconstructing hypergraph matching polynomials”, arXiv:2501.19081 (2025).

Additional references

4 papers in this index state this conjecture (2016–2025). The statement above is taken from the most recent of them; the others are arXiv:1804.07104, arXiv:1610.00117, arXiv:1609.09550.

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