English

Finding a perfect matching of $\mathbb{F}_2^n$ with prescribed differences

Combinatorics 2024-09-04 v2

Abstract

We consider the following question by Balister, Gy\H{o}ri and Schelp: given 2n12^{n-1} nonzero vectors in F2n\mathbb{F}_2^n with zero sum, is it always possible to partition the elements of F2n\mathbb{F}_2^n into pairs such that the difference between the two elements of the ii-th pair is equal to the ii-th given vector for every ii? An analogous question in Fp\mathbb{F}_p, which is a case of the so-called "seating couples" problem, has been resolved by Preissmann and Mischler in 2009. In this paper, we prove the conjecture in F2n\mathbb{F}_2^n in the case when the number of distinct values among the given difference vectors is at most n2logn1n-2\log n-1, and also in the case when at least a fraction 12+ε\frac12+\varepsilon of the given vectors are equal (for all ε>0\varepsilon>0 and nn sufficiently large based on ε\varepsilon).

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Cite

@article{arxiv.2310.17433,
  title  = {Finding a perfect matching of $\mathbb{F}_2^n$ with prescribed differences},
  author = {Benedek Kovács},
  journal= {arXiv preprint arXiv:2310.17433},
  year   = {2024}
}

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19 pages