arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.10832math.CO
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点序图中的镶嵌

Tilings in vertex ordered graphs

Jozsef Balogh, Lina Li, Andrew Treglown

摘要:

近年来,人们对点序图的Turán性质和Ramsey性质都很感兴趣。在这篇论文中,我们开始研究在点序图中嵌入生成结构。特别是,我们介绍了一个一般的框架来接近的问题,确定最低程度的阈值,迫使一个完美的$H$平铺有序图。在(无序)图设置中,这个问题由Kühn和Osthus解决[完美图填充的最小度阈值,Combinatorica,2009]。我们使用我们的一般框架来解决区间色数$2$的所有有序图$H$的完美$H$ -平铺问题。已经在这个限制设置类极值的例子是丰富的比无序图的问题。在证明我们的结果的过程中,新的方法的规律性和吸收方法的发展。

英文摘要:

Over recent years there has been much interest in both Turán and Ramsey properties of vertex ordered graphs. In this paper we initiate the study of embedding spanning structures into vertex ordered graphs. In particular, we introduce a general framework for approaching the problem of determining the minimum degree threshold for forcing a perfect $H$-tiling in an ordered graph. In the (unordered) graph setting, this problem was resolved by Kühn and Osthus [The minimum degree threshold for perfect graph packings, Combinatorica, 2009]. We use our general framework to resolve the perfect $H$-tiling problem for all ordered graphs $H$ of interval chromatic number $2$. Already in this restricted setting the class of extremal examples is richer than in the unordered graph problem. In the process of proving our results, novel approaches to both the regularity and absorbing methods are developed.

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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