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arXiv 1611.01433math.CO
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超图的在线容器,以及对线性方程的应用

Online containers for hypergraphs, with applications to linear equations

David Saxton, Andrew Thomason

摘要:

一个超图G的容器集是顶点子集的集合,使得对于G中的每一个独立的(或者仅仅是稀疏的)集合,在集合中都有某个子集包含它。集合中的集合不应该很大,集合本身应该相对较小。Balogh、Morris和Samotij以及作者已经展示了具有有用特性的容器,以及一些应用。我们在这里的目的是给出一个比我们之前使用的算法更简单的算法,它仍然产生具有我们之前定理所需的所有属性的容器。此外,该算法产生具有所谓的在线属性的容器,允许以前的着色应用程序扩展到所有超图,而不仅仅是简单的超图。为了说明的目的,我们包括一个完整的证明稍微弱,但更简单的版本的定理,这对许多(也许是大多数)应用程序是足够的。我们还提出了一些应用程序的解决方案,免费的线性方程,包括西顿集的数量,以前宣布,但没有证明。

英文摘要:

A set of containers for a hypergraph G is a collection of vertex subsets, such that for every independent (or, indeed, merely sparse) set in G there is some subset in the collection which contains it. No set in the collection should be large and the collection itself should be relatively small. Containers with useful properties have been exhibited by Balogh, Morris and Samotij and by the authors, along with several applications. Our purpose here is to give a simpler algorithm than the one we used previously, which nevertheless yields containers with all the properties needed for our previous theorem. Moreover this algorithm produces containers having the so-called online property, allowing previous colouring applications to be extended to all, not just simple, hypergraphs. For illustrative purposes, we include a complete proof of a slightly weaker but simpler version of the theorem, which for many (perhaps most) applications is plenty. We also present applications to the number of solution-free sets of linear equations, including the number of Sidon sets, announced previously but not proven.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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