Excluding paths and antipaths

Excluding paths and antipaths
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排除路径和反路径

DOI:
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发表时间:
2015
期刊:
Comb.
影响因子:
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通讯作者:
P. Seymour
P. Seymour
中科院分区:
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文献类型:
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作者:
M. Chudnovsky;P. Seymour

文献摘要

被引文献

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Erdős-Hajnal 猜想指出,对于每个图 H,都存在一个常数 δ(H)>0,这样,如果图 G 没有与 H 同构的导出子图,则 G 包含一个团或一个大小至少为 |V (G)|δ(H) 的稳定集。这个猜想仍然存在。我们考虑该猜想的一个变体,其中 H 和 Hc 都被排除,而不是排除 H 作为诱导子图。我们在 H 是五边路径的情况下证明了这个修改后的猜想。我们的第二个主要结果是其非对称版本:我们证明对于每个图 G,使得 G 不包含诱导的六边路径,并且 Gc 不包含诱导的四边路径,G 包含多项式大小的团或稳定集。
The Erdős-Hajnal conjecture states that for every graph H, there exists a constant δ(H)>0, such that if a graph G has no induced subgraph isomorphic to H, then G contains a clique or a stable set of size at least |V (G)|δ(H). This conjecture is still open. We consider a variant of the conjecture, where instead of excluding H as an induced subgraph, both H and Hc are excluded. We prove this modified conjecture for the case when H is the five-edge path. Our second main result is an asymmetric version of this: we prove that for every graph G such that G contains no induced six-edge path, and Gc contains no induced four-edge path, G contains a polynomial-size clique or stable set.