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首页> 外文期刊>Journal of Combinatorial Theory, Series B >Induced subgraphs of graphs with large chromatic number. VI. Banana trees
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Induced subgraphs of graphs with large chromatic number. VI. Banana trees

机译:诱导具有大色数的图表的子图。 VI。 香蕉树

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We investigate which graphs H have the property that in every graph with bounded clique number and sufficiently large chromatic number, some induced subgraph is isomorphic to a subdivision of H. In an earlier paper [6], the first author proved that every tree has this property; and in another earlier paper with Maria Chudnovsky [2], we proved that every cycle has this property. Here we give a common generalization. Say a "banana" is the union of a set of paths all with the same ends but otherwise disjoint. We prove that if H is obtained from a tree by replacing each edge by a banana then H has the property mentioned. (C) 2020 Elsevier Inc. All rights reserved.
机译:我们研究了哪些图H具有这样的性质:在每一个具有有界团数和足够大色数的图中,某些诱导子图同构于H的一个子图。在之前的文章[6]中,第一作者证明了每一棵树都具有这个性质;在Maria Chudnovsky[2]的另一篇早期论文中,我们证明了每个循环都有这个性质。这里我们给出一个通用的概括。假设“香蕉”是一组路径的并集,所有路径都有相同的端点,但在其他方面是不相交的。我们证明,如果H是通过用香蕉代替每一条边从树上得到的,则H具有上述性质。(C) 2020爱思唯尔公司版权所有。

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