The odd-order near-factor characterization conjecture

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Let v=2n+1v=2n+1 be an odd integer, let KvK_v be the complete graph on {0,1,…,v−1}\{0,1,\ldots,v-1\}, and let LL be a list of nn positive integers not exceeding nn. A near 11-factor FF is a set of nn pairwise disjoint edges, and ℓ(F)\ell(F) is its list of edge-lengths. The near-factor characterization conjecture. There exists a near 11-factor FF of KvK_v such that ℓ(F)=L\ell(F)=L if and only if, for any divisor dd of vv, the number of multiples of dd appearing in LL does not exceed v−d2\frac{v-d}{2}. This is presented as a generalization of Bacher's problem for odd order. The supplied text gives no resolution.

References

Primary source

M. Meszka, A. Pasotti and M. A. Pellegrini, “The seating couple problem in even case”, arXiv:2308.16553 (2023).

Additional references

2 papers in this index state this conjecture (2014–2023). The statement above is taken from the most recent of them; the others are arXiv:1404.3890.

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