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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2508.15698 |
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- A 1-factorisation of a regular graph $G$ is a partition of its edge set $E(G)$ into perfect matchings of $G$. Behague asked for the minimal $r=r(d)$ such that some $1$-factorisation of the $d$-dimensional hypercube $Q_d$ has the property that the union of any $r$ of its 1-factors is connected. Previous work by Laufer on perfect $1$-factorisations implied that $r$ is at least three, and Behague gave a construction with $r=\big\lceil\frac{d}{2}\big\rceil+1$. We improve this upper bound, giving a random construction with $r=O(\log d)$. In other words, we prove the existence of a 1-factorisation $\mathcal{M} = \{M_1,\dotsc,M_d\}$ of the hypercube $Q_d$ such that every $\mathcal{N}\subseteq \mathcal{M}$ of size $Ω(\log d)$ is such that $\bigcup \mathcal{N}$ is connected.