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arXiv 1706.08545math.CO
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超立方体的正交对称链分解

Orthogonal Symmetric Chain Decompositions of Hypercubes

Hunter Spink

摘要:

1979年,Shearer和Kleitman证明了超立方体$Q_n$存在$\lfloor n/2 \rfloor+1$正交链分解,并构造了两个正交链分解.在本文中,我们作出了第一个非平凡的进展,因为通过构造三个正交链分解的$Q_n$的$n$足够大。为此,我们引入了“几乎正交对称链分解”的概念。我们明确地描述了三个这样的分解的$Q_5$和$Q_7$,并描述了条件,使我们能够分解产品的超立方体到$k$几乎正交对称链分解,这样的分解的原始超立方体。

英文摘要:

In 1979, Shearer and Kleitman conjectured that there exist $\lfloor n/2 \rfloor+1$ orthogonal chain decompositions of the hypercube $Q_n$, and constructed two orthogonal chain decompositions. In this paper, we make the first non-trivial progress on this conjecture since by constructing three orthogonal chain decompositions of $Q_n$ for $n$ large enough. To do this, we introduce the notion of "almost orthogonal symmetric chain decompositions". We explicitly describe three such decompositions of $Q_5$ and $Q_7$, and describe conditions which allow us to decompose products of hypercubes into $k$ almost orthogonal symmetric chain decompositions given such decompositions of the original hypercubes.

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